AP Computer Science AUnits, Exam Format & Resources

The AP Computer Science A exam is 3 hours long. Section I has 40 multiple choice questions in 90 minutes, worth 50% of the score. Section II has 4 free response questions in 90 minutes, worth the other 50%. All four free response questions require writing syntactically correct Java code. Each free response question is worth approximately 9 points for a 36 point section total. No calculator is permitted on any part of the exam. College Board provides a Java Quick Reference sheet during both sections.

The four free response question types are: Methods and Control Structures (writing methods using conditionals and loops), Class Design (writing a complete class with instance variables, constructors, and methods), Array or ArrayList (implementing methods that manipulate a one-dimensional collection), and 2D Array (traversing and processing a two dimensional array). Each type targets a specific programming skill cluster, and all four require writing working Java code. The order in which these types appear on the exam changes from year to year.

The 10 units are: 1) Primitive Types, 2) Using Objects, 3) Boolean Expressions and if Statements, 4) Iteration, 5) Writing Classes, 6) Array, 7) ArrayList, 8) 2D Array, 9) Inheritance, and 10) Recursion. Units 3 (15 to 17.5%) and 4 (17.5 to 22.5%) carry the most exam weight. Unit 6 (Array, 10 to 15%) is next. The full weighting breakdown for all 10 units is in the table on this page.

The four Big Ideas are Modularity (MOD), which covers program design, abstraction, and decomposition through methods and classes; Variables (VAR), which covers data types, scope, reference types, and the effect of operations on stored values; Control (CON), which covers conditional logic, iteration, and control flow; and Impact of Computing (IOC), which covers data privacy, intellectual property, and societal effects of software. IOC topics appear in the multiple choice section but not in free response questions.

In 2024, approximately 69.7% of 74,123 students scored 3 or higher, with a mean score of 3.30, according to College Board score distribution data. The pass rate was approximately 67.9% in 2023 and 68.5% in 2022. AP CS A consistently produces one of the higher 5-rates among all AP exams, with approximately 24 to 27% of test takers earning the top score in recent years. The self selected nature of the AP CS A population, students who deliberately opt into a Java programming course, contributes to the relatively strong score profile.

AP CS A is demanding because all four free response questions require writing working Java code under timed conditions, not just describing concepts. Students who have prior programming experience or who practice writing Java code regularly tend to perform well. The consistent pass rate of 67 to 70% reflects a course population that is more self selected than many other AP subjects: students who take AP CS A are disproportionately prepared for systematic, precise thinking. That said, the 2D Array FRQ has consistently been identified as the question type with the lowest mean score per available points in recent Chief Reader Reports.

No calculator is permitted on any part of the AP Computer Science A exam. College Board provides a Java Quick Reference sheet during both sections of the exam. The reference sheet lists the signatures and descriptions of key methods for the String, Integer, Double, List, and ArrayList classes. Students should be completely familiar with this reference and know which methods appear on it versus which they must recall from memory.

The Java Quick Reference sheet provided by College Board during the AP CS A exam lists method signatures and brief descriptions for the String class (length, substring, indexOf, equals, compareTo), the Integer and Double wrapper classes (intValue, doubleValue, parseInt, compareTo), and the List and ArrayList interfaces and classes (size, add, get, set, remove, isEmpty). It does not contain Java syntax rules, control flow templates, or algorithm patterns; those must be known from study. Knowing exactly what is and is not on the reference sheet is a key component of efficient exam preparation.

Credit policies vary by institution and score. Most four year colleges that award credit for AP CS A grant 3 to 4 credit hours equivalent to an introductory Java or object oriented programming course for a score of 3, 4, or 5. Some selective institutions require a 4 or 5, and credit may or may not fulfill a major requirement depending on the program. Use the AP Credit Savings Calculator linked on this page to see the exact credit and tuition savings at specific target institutions.

AP exams are administered each May on College Board's published schedule. The AP Computer Science A exam is typically scheduled in the morning during the first two weeks of May. Use the AP Exam Date Countdown linked on this page to track the exact days remaining until the next AP CS A administration and plan your preparation timeline accordingly.