How many times does `for (int i = 0; i < 5; i++)` execute?
Correct answer: $5$
Why: The loop runs for $i=0,1,2,3,4$, which is five iterations.
AP CS A Practice Questions: Free Questions
Answer original AP-style diagnostic questions, review explanations, and identify the next unit to study.
AP Computer Science A diagnostic practice set
These are original practice questions, not copied College Board items. Use official released questions for final calibration.
Question 1 of 3
Review the reasoning after you finish
The interactive set keeps answers hidden while you work. This review section remains crawlable and gives every student a complete correction path after the attempt.
For object references `a` and `b`, what does `a == b` test?
Correct answer: Whether they refer to the same object
Why: For object references, `==` tests reference identity, not equal field values.
After `list.add(x)` successfully appends one element to an `ArrayList`, how does its size change?
Correct answer: It increases by one
Why: Appending one element increases the list's size by one.
Practise each section under its own calculator rule
Practising with a calculator you will not be handed is the most common way a practice score stops predicting an exam score. Set each practice block up to match the section it rehearses.
| Section or part | What you may use | What that means for your work |
|---|---|---|
| Multiple choice | No calculator | Arithmetic here is integer division and remainders you can do in your head. |
| Free response | No calculator | You write Java by hand on the exam. Practise without autocomplete or a compiler. |
| Provided for the whole exam | Java Quick Reference | String, Math, ArrayList, and Object methods are listed. Anything not on that sheet, you must remember. |
How practice should cover the complete course
Using Objects and Methods
Types, expressions, strings, methods, APIs
15–25%: practice one recognition question, one direct application, and one mixed prompt that requires you to choose this unit without being told.
Selection and Iteration
Boolean logic, conditionals, loops, algorithms
25–35%: practice one recognition question, one direct application, and one mixed prompt that requires you to choose this unit without being told.
Class Creation
Fields, constructors, methods, encapsulation
10–18%: practice one recognition question, one direct application, and one mixed prompt that requires you to choose this unit without being told.
Data Collections
Arrays, ArrayList, 2D arrays, traversal, recursion
30–40%: practice one recognition question, one direct application, and one mixed prompt that requires you to choose this unit without being told.
Use the result to focus your AP Computer Science A review
Read the score as a map, not a verdict
Each answer shows a relationship between course knowledge and an exam decision. A miss may mean that a definition is unclear, a representation was misread, or the right method was not selected. Compare each miss with these AP Computer Science A priorities before choosing the next unit or practice set.
- Loop tracing
- Array and ArrayList mutation
- Class invariants
- 2D traversal
- FRQ method signatures and return paths
Next steps after the AP Computer Science A diagnostic
Use a four-step correction cycle
- Write the rule or idea behind every miss.
- Solve a second problem of the same type without looking back.
- Mix that skill with two older units tomorrow.
- Complete official released questions under authentic timing.
Questions about AP Computer Science A exam practice
How many questions are on the AP Computer Science A exam?
The published format is 42 questions on multiple choice and 4 questions on free response. Multiple choice — About 2.1 minutes each. Code-tracing items take longer than vocabulary items, so move fast on the short ones. Free response — About 22 minutes each. Write the method header first, then the return statement, then fill in the middle.
Which AP Computer Science A units should I practise first?
Start with the heaviest published weightings: Data Collections (30–40%), Selection and Iteration (25–35%), Using Objects and Methods (15–25%). Then repair whichever earlier unit those depend on.
Can I use a calculator while I practise for AP Computer Science A?
Only where the exam allows one, and practising otherwise builds the wrong habit. Multiple choice: Arithmetic here is integer division and remainders you can do in your head. Free response: You write Java by hand on the exam. Practise without autocomplete or a compiler. Provided for the whole exam: String, Math, ArrayList, and Object methods are listed. Anything not on that sheet, you must remember.
What is the most common way students lose points on AP Computer Science A?
Off-by-one errors on bounds. Arrays use .length, Strings use .length(), and ArrayLists use .size() - and valid indexes stop one below each of them.
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