AP Computer Science A review: exam format, the 4 units, and how to study

What’s on the AP Computer Science A exam

The AP Computer Science A exam splits into two sections. Section I is 42 multiple-choice questions worth 55%, mostly individual questions that ask you to trace and reason about Java code. Section II is 4 free-response questions in 90 minutes, worth 45%, where you write working Java by hand for each prompt. The course was recently redesigned, condensing the old ten units into four.

A helpful detail: the Java Quick Reference — a list of the accessible Java library methods — is provided in Bluebook, so you do not have to memorize method signatures. The whole exam is fully digital. Our AP CSA FRQ guide breaks down each of the four coding questions.

The 4 units of AP Computer Science A

The redesigned course is organized into four units. Selection and Iteration — Boolean logic, conditionals, and loops — is the largest, and Data Collections anchors half of the free response.

How AP Computer Science A is scored

Your multiple-choice and free-response points combine into one composite score, which the College Board scales to a 1–5. AP Computer Science A is one of the more polarized exams: in 2024, about 67% of students scored a 3 or higher and 24% earned a 5, but a similar share scored a 1 — reflecting the split between students who genuinely learned to code and those who did not.

The free response is where that split shows most, since you either can write the method or you cannot. To see what a practice raw score becomes, run it through our AP CSA score calculator.

How to study for AP Computer Science A

Write code, do not just read it. The single biggest predictor of a good score is having written many small programs yourself, so practice coding the common patterns — traversing arrays and ArrayLists, nested loops over 2D arrays, and writing classes — until they are automatic. Learn to hand-write Java cleanly, since the free response is not typed into a compiler.

Then drill the exam’s exact question types. Work past free-response questions against the scoring guidelines with our AP CSA FRQ guide, get familiar with the methods on the Java Quick Reference, and drill one unit at a time with the Progress Check walkthroughs.

When is the AP Computer Science A exam, and how long is it

AP Computer Science A is given once a year during the College Board’s May testing window, and the exam takes about 3 hours. The exact date and start time are set each year, so confirm the current schedule on the official AP calendar with your coordinator before you plan around it.