Acing Your ABSN Prerequisite Courses

ABSN prerequisite courses give you the science and quantitative foundation you will use in nursing school. Your grades may also affect admission, especially in anatomy and physiology, microbiology, chemistry, and statistics.

These courses can feel intimidating if you have been away from school or did not study science in your first degree. You do not need a special “science brain” to succeed. You need a realistic schedule, active study methods, frequent practice, and early help when a topic does not make sense.

This guide explains how to study for common ABSN prerequisites, prepare for labs and exams, and respond if your first grade falls below a program’s standard. If you still need to determine which courses to take, start with our ABSN prerequisites guide. Requirements, accepted course formats, expiration rules, and minimum grades vary by school.

Before You Start Your Prerequisite Courses

A strong study plan begins before the first class meeting. Confirm that each course will meet the requirements of the ABSN programs you may apply to.

Before registering:

Compare the prerequisite lists for several target programs.
Confirm whether each science course must include a lab.
Ask whether the program accepts online courses and virtual labs.
Check whether science courses expire after a set number of years.
Confirm the minimum acceptable course grade.
Ask how repeated courses affect the admission review.
Save the syllabus and official course description for every class.
Request written course-equivalency approval when a course title or format could cause uncertainty.

The nursing school’s admission office makes the final decision about whether a course qualifies. Do not rely only on a college adviser, transfer database, or another applicant’s experience.

Build a Manageable Course Schedule

Do not assume that finishing every prerequisite in one term will produce the fastest route into an ABSN program. A schedule that leads to weak grades could delay your application.

Think carefully before combining anatomy and physiology, microbiology, and chemistry in the same term. Each course can include lectures, lab preparation, assignments, quizzes, and cumulative exams. Work hours, caregiving duties, commute time, and the number of years since your last science class should influence your schedule.

If possible, review the syllabus before registration. Look at the number of weekly lab hours, major exams, required projects, attendance rules, and grading weights.

Quick Guide to Common ABSN Prerequisites

Course	Common challenge	Useful study approach
Anatomy and Physiology	Learning many structures while understanding how body systems interact	Label diagrams from memory, explain physiological processes, and use cumulative quizzes
Microbiology	Organizing organisms, processes, immune responses, and laboratory methods	Build comparison charts, use case examples, and practice identifying relationships
Chemistry	Applying concepts through formulas, equations, and calculations	Work problems regularly, show each step, and review the cause of every error
Statistics	Choosing and interpreting the correct measure or method	Translate terms into plain language, interpret graphs, and solve varied practice problems
Psychology or Human Development	Comparing theories and applying them across the lifespan	Use case studies, timelines, and comparison tables
Nutrition	Connecting nutrients and metabolism with health outcomes	Map biological processes, compare nutrient sources, and apply concepts to sample cases

Programs may require additional courses such as biology, pathophysiology, sociology, or medical terminology. Use the methods below as a starting point, then adjust them to your instructor’s objectives and exam format.

How to Study Anatomy and Physiology

Anatomy and physiology requires two related skills. Anatomy asks you to identify structures and locations. Physiology asks you to explain how those structures work. Students often struggle when they memorize isolated terms without understanding the larger system.

Connect Structure With Function

For each structure, ask three questions:

Where is it located?
What does it do?
How does its structure support that function?

For example, do not stop after identifying the alveoli in the lungs. Explain how their thin walls and large surface area support gas exchange. Then connect that process with the movement of oxygen and carbon dioxide.

Draw and Label From Memory

Looking at a labeled diagram can create a false sense of mastery. Close the book and reproduce the diagram on blank paper. Label as much as you can, check your work, and repeat the missed parts later.

Use the same method for sequences. Practice drawing the route of blood through the heart, the path of an electrical impulse, or the steps involved in urine formation without looking at your notes.

Explain Each Process Aloud

Choose one process and explain it in plain language without notes. If you cannot explain what happens next or why it happens, you have found a gap to review.

This form of self-explanation works well for topics such as:

Muscle contraction
Nerve signaling
Blood-pressure regulation
Hormonal feedback
Gas exchange
Fluid and electrolyte balance

Prepare for Practical Exams

If the course includes identification exams, practice with the same types of materials used in the lab. Models, specimens, microscope slides, and two-dimensional images can look different from textbook illustrations.

Practice identifying structures from multiple angles. Use unlabeled images and set a time limit so your review resembles the exam.

Common mistake to avoid: Spending most of your time rereading or coloring diagrams without testing whether you can retrieve the information independently.

How to Study Microbiology

Microbiology combines terminology, biological processes, organism characteristics, immune response, and laboratory procedures. The volume becomes more manageable when you organize information by relationships instead of treating every fact separately.

Build Comparison Charts

Use tables to compare features your course emphasizes, such as:

Cell type and structure
Shape and arrangement
Gram-stain response
Oxygen requirements
Method of transmission
Mechanism of disease
Prevention or control method

Your instructor’s learning objectives should determine which organisms and characteristics deserve the most attention.

Follow Processes Step by Step

Draw processes such as microbial growth, inflammation, antibody response, or viral replication. Include the order of events and the reason each step occurs.

After studying a process, change one condition. Ask how the result would differ if the host had a weakened immune response, an organism used a different transmission route, or a laboratory step were performed incorrectly.

Use Short Case Examples

Case questions can help you connect an organism with transmission, symptoms, immune response, and infection prevention. Keep your conclusions within the material covered in the course. An introductory prerequisite generally does not require you to recommend clinical treatment.

Microbiology can also help you understand why infection-control practices matter in healthcare. The CDC explains that Standard Precautions apply during patient care based on the expected exposure. These clinical precautions relate to, but are not the same as, the aseptic procedures used in a microbiology lab.

Common mistake to avoid: Memorizing a long list of organisms without comparing their characteristics or understanding the processes that connect them.

How to Study Chemistry

Chemistry rewards regular problem-solving. Reading a worked example may make a method seem clear, but you need to complete problems independently to learn when and how to use it.

Practice in Short, Frequent Sessions

Work several problems on most study days instead of saving a large set for the night before an exam. Mix current material with earlier topics so you continue retrieving older skills.

Show each step, include units, and check whether the final answer is reasonable. This method makes it easier to find the point where an error began.

Use an Error Log

For every missed problem, record:

The type of problem
The step where the error occurred
Why you made the error
The correct method
A similar problem to solve later

An error log can reveal patterns. You may understand the chemical concept but struggle with algebra, unit conversion, significant figures, or selecting the correct equation.

Connect Chemistry With Biology

Where the course permits, connect concepts such as acids and bases, solutions, molecular structure, polarity, and chemical equilibrium with biological examples. These connections can make abstract material easier to remember.

Unit analysis and concentration problems may also prepare you for later nursing calculations, although the content of a prerequisite chemistry course varies.

Common mistake to avoid: Watching someone else solve problems and counting that activity as independent practice.

How to Study Statistics

Statistics asks you to understand what numbers mean, not simply calculate them. Focus on choosing an appropriate method and explaining the result in context.

Translate Each Term Into Plain Language

For every new measure or test, answer:

What question does it help answer?
What type of data does it use?
What assumptions does it make?
What can the result support?
What can the result not prove?

Build a short example for terms such as mean, median, standard deviation, confidence interval, correlation, statistical significance, bias, and confounding.

Interpret Graphs and Research Summaries

Practice reading tables, charts, and short research results. Identify the sample, variables, study design, and main finding. Ask whether the graph supports the conclusion and whether another factor could explain the result.

If your class uses statistical software, learn to interpret the output rather than memorizing which buttons to press. Your instructor may still require hand calculations, so follow the course objectives.

Common mistake to avoid: Memorizing formulas without understanding which question each formula addresses.

How to Study Psychology and Human Development

Psychology and human development courses often require students to compare theories and apply them to behavior across different stages of life.

Create Comparison Tables

Compare major theories by their central idea, developmental stages, strengths, and limitations. Then apply each theory to a short example.

For lifespan development, create a timeline that covers physical, cognitive, and social changes from infancy through older adulthood. Connect each stage with age-appropriate communication and health behavior.

Practice With Cases

Use short scenarios to identify which concept best explains a behavior. Explain why the concept fits and why another option does not. This prepares you for application questions more effectively than memorizing definitions alone.

Common mistake to avoid: Knowing the name of a theory but being unable to recognize it in a real situation.

How to Study Nutrition

Nutrition combines factual knowledge with biological processes and practical application. Students may need to understand nutrients, digestion, metabolism, dietary assessment, and how nutritional needs change across the lifespan.

Organize Nutrients by Function

For each major nutrient, learn its primary functions, common food sources, absorption or metabolic pathway, and the effects of deficiency or excess. Use comparison tables instead of separate lists.

Map Metabolic Processes

Draw simplified pathways for digestion, absorption, energy use, and storage. Explain where each process occurs and what changes under different conditions.

Apply Concepts Carefully

Use sample cases to calculate or interpret nutritional information if your course requires it. Separate evidence-based course material from diet claims found on social media or commercial sites.

Common mistake to avoid: Memorizing food lists without understanding the biological role of each nutrient.

Study Methods That Work Across Subjects

Different subjects require different forms of practice, but several methods apply across most ABSN prerequisites.

Retrieve Information Without Looking

Close your notes and answer a question, label a diagram, solve a problem, or explain a process from memory. Then check the answer and correct it.

Retrieval practice does more than measure what you know. It helps strengthen later recall. The Institute of Education Sciences recommends using quizzes to help students retrieve and retain course content.

Space Your Review

Return to material over several days and weeks. A simple review pattern might revisit a topic the next day, several days later, and again the following week. Adjust the interval based on how well you remember it.

Research reviews have found benefits from distributed practice and retrieval practice, including in health-professions education. However, no single schedule works for every student or subject.

Once you understand a new skill, mix it with problems from earlier units. Mixed practice forces you to identify which method a question requires. This is especially useful in chemistry and statistics.

Review Errors, Not Just Scores

After a quiz or practice set, classify each error:

Missing knowledge
Confused concept
Calculation error
Misread question
Weak time management
Guess without reasoning

Then choose a response that fits the cause. Rereading a chapter may not help if the real problem was calculation practice or misreading the question.

Use Study Groups for Active Practice

A study group should require each member to retrieve and explain information. Ask one another questions, compare problem-solving methods, and identify gaps. Avoid meetings that become shared rereading sessions.

Ask for Help Early

Use office hours, tutoring, review sessions, and instructor feedback before a weak grade becomes difficult to recover from. Bring a specific question and show the work you have already attempted.

Free resources such as Khan Academy and OpenStax can provide extra explanations and practice. Use them to support the assigned course materials, not replace your instructor’s objectives.

How to Prepare for Science Labs

Science labs test preparation, observation, procedure, and analysis. They may also have strict attendance and safety rules.

Before each lab:

Read the procedure and identify its purpose.
Review required safety steps.
List the measurements, structures, or organisms you must recognize.
Predict the expected result when appropriate.
Write down questions before arriving.

During the lab:

Follow the instructor’s procedure and safety directions.
Record observations as they occur.
Label measurements and samples clearly.
Ask when a step or result does not make sense.
Note possible sources of error.

After the lab, explain what happened and why. Do not stop after completing the worksheet. Lab practicals often require you to reproduce procedures or recognize materials without the support of a step-by-step guide.

What If You Earn a Low Prerequisite Grade?

One low grade does not automatically end your ABSN plans, but you should investigate the policy before deciding what to do next.

Check Each Program’s Rule

Ask the admission office:

Does the grade meet the minimum requirement?
Does the program calculate a separate prerequisite or science GPA?
May I repeat the course?
Will both attempts appear in the admission calculation?
Is there a limit on prerequisite repeats?
Would a stronger grade improve my application?

Obtain the answer in writing when possible. Schools may treat repeated courses differently.

Diagnose the Cause Before Retaking the Course

A repeat is most useful when you change the condition that caused the first result. Consider whether the problem involved:

Too many demanding courses at once
Work or family demands
Weak background knowledge
Passive study methods
Missed classes or labs
Test anxiety or poor time management
Waiting too long to request help

Build a different schedule and study system before enrolling again. Repeating the same approach can produce the same result.

Frequently Asked Questions

Which ABSN prerequisite is usually the hardest?

Many students find anatomy and physiology, microbiology, or chemistry challenging because these courses combine a large amount of material with laboratory work or problem-solving. The hardest course depends on your academic background and study habits.

Should I take anatomy and microbiology together?

Some students can succeed in both courses during the same term, but each may include a demanding lab. Review the syllabi and consider your work hours, family responsibilities, and recent science experience before combining them.

Can I complete ABSN prerequisites online?

Some ABSN programs accept online courses, while others restrict online science courses or virtual labs. Confirm the policy with each nursing school before registering.

How many hours should I study each week?

There is no reliable universal number. Reserve regular study time from the first week, then adjust it based on the course pace, laboratory workload, quiz results, and your prior knowledge. Courses with labs often require preparation outside both lecture and laboratory hours.

Is a B acceptable in an ABSN prerequisite?

A B meets the stated minimum at many programs, but admission standards vary and meeting a minimum does not guarantee admission. Check the required grade, average admitted GPA if published, and method used to calculate prerequisite grades.

Can I retake a prerequisite course?

Many schools allow repeats, but policies differ. A program may use the highest grade, the latest grade, both attempts, or an average. Some schools also limit the number of repeated courses. Request a policy answer from admissions before enrolling again.

Do prerequisite grades affect ABSN admission?

They often do. A school may review the cumulative GPA, science GPA, prerequisite GPA, individual course grades, or a combination of these measures. Check the published admission criteria for every program on your list.

Final Prerequisite Success Checklist

Before the term:

Confirm that each course and lab meets your target programs’ requirements.
Build a course load that leaves enough time for regular practice.
Save the syllabus and official course description.
Identify tutoring, office hours, and other academic support.

Each week:

Review new material within a short period after class.
Retrieve information without looking at your notes.
Work practice problems and review every error.
Revisit material from earlier units.
Prepare for lab before arriving.
Ask for help as soon as confusion appears.

Before each exam:

Use the instructor’s objectives to define what to study.
Complete mixed and cumulative practice.
Test yourself under a reasonable time limit.
Spend extra time on weak areas identified through practice.
Protect your sleep and arrive with the required materials.

Strong prerequisite performance comes from consistent practice, useful feedback, and early adjustments. The habits you build now can also help you manage the faster pace of an accelerated nursing program.

Last reviewed: September 2026. Study guidance was reviewed for clarity and consistency with current learning research. ABSN course, lab, grade, repeat, and expiration policies vary by school. Confirm requirements directly with each program before enrolling.