Cenefit · 2025–2026 AP CSA

From hello world
to a 5.

The complete, interactive AP Computer Science A study guide. Every unit, every topic, with a built-in Java IDE and FRQ practice — aligned to the College Board's redesigned 4-unit course.

Start Unit 1 → Take Practice Test Open Java IDE
4Units
30+Lessons
40Test Qs
8FRQs
The Curriculum

Four Units, Built to Master

The redesigned AP Computer Science A course covers four big ideas. Click any unit to begin.

Unit 0115–25%
Using Objects and Methods
Primitives, expressions, objects, classes, constructors, void and non-void methods, Strings, and the Math class.
📚 9 lessons · ~3 hours
Unit 0225–35%
Selection and Iteration
Boolean expressions, if/else statements, De Morgan's laws, for and while loops, nested iteration, and code analysis.
📚 8 lessons · ~4 hours
Unit 0310–18%
Class Creation
Designing classes, public vs. private, instance variables, constructors, accessor/mutator methods, scope, and the this keyword.
📚 7 lessons · ~3 hours
Unit 0430–40%
Data Collections
Arrays, ArrayList, 2D arrays, recursion, binary search, merge sort, plus ethics around data collection.
📚 12 lessons · ~6 hours
How It Works

Active Learning, Not Passive Reading

Read it, run it, change it, master it.

📖

Read & Run

Every topic comes with working Java code you can execute, edit, and break — right in the browser. No setup, no Java install.

🧠

Quiz Yourself

Every section ends with AP-style multiple-choice questions. Wrong answer? You'll see the correct one highlighted with an explanation.

✍️

Practice FRQs

The exam is 50% free-response. Practice all four types — Methods, Class, Array, 2D Array — with rubrics modeled on real scoring.

🎯

Exam Strategy

Time management, common traps, and a checklist of the algorithms that show up year after year. Tactical, not theoretical.

⏱ Full-length practice test

40 questions, 90 minutes, exactly like the real exam

Same length, same time limit, same topic distribution as Section I of the actual AP CSA exam. Timer, mark-for-review, and a scored breakdown by unit when you're done.

Take the test →

Ready to start?

Begin with Unit 1 or jump straight to FRQ practice if you've covered the content.

Start Unit 1 FRQ Practice