Learn Java, Pass The AP
The Easy Way
Interactive lessons. Socratic tutor, No paywall,
Master AP CSA.
String a = "cat";
String b = "cat";
System.out.println(a.equals(b));Our Curriculum
Why CSA Compass
Most resources teach Java. CSA Compass teaches the exam.
Every lesson, practice question and mock exam is built around the AP Computer Science A course — starting from zero programming experience and ending at exam day. Nothing you study here is off-syllabus, and nothing on the exam is left out.
Built for one exam
Eleven phases, from first setup to searching and sorting, in the order that makes each idea land — not a general Java tutorial you have to translate yourself.
Guided, not given
The tutor already knows the question you're stuck on, so it asks the question that gets you there instead of handing over an answer you'd forget by tomorrow.
Knows your weak spots
Your accuracy is tracked per topic as you answer, so the weakest areas surface first and revision goes where it actually counts.
If you have any questions, Ask AI
Assistive learning to teach, not give the answer
⚡ Practice — answer every question to complete the lesson
list?Then you write the code yourself
Free-response projects that compile and run in the browser — nothing to install
Employee and Manager
An Employee stores a name and a base pay. A Manager is an Employee who
also earns a bonus — it calls the superclass constructor instead of storing those
itself, and overrides getPay. Write describe once, in
Employee, and let the override do the rest.
public Employee(String name, int basePay)
public int getPay()
public String describe()
public Manager(String name, int basePay, int bonus)
| Call | Returns |
|---|---|
| new Employee("Ada", 100).describe() | Ada earns 100 |
| new Manager("Bo", 100, 50).getPay() | 150 |
| Employee e = bo; e.describe() | Bo earns 150 |
public class Manager extends Employee {
private int bonus;
public Manager(String name, int basePay, int bonus) {
super(name, basePay);
this.bonus = bonus;
}
public int getPay() {
return super.getPay() + bonus;
}
}Track your progress
CSA Compass will automatically track your proficiency in different topics
Know what to work on
We will provide material tailored to what you need to work on
No paywall…Ever
Never get stuck alone
Join the CSA Compass Discord — study with other AP CSA students, get unstuck in minutes, share your projects, and keep each other on track all the way to exam day.
Join the DiscordQuestions you may have
Yes — completely free. No paywall, no credit card, no premium tier. Every lesson, every practice question, and the AI tutor are free, forever.
Nope. CSA Compass starts at Phase 0 assuming zero programming experience and builds all the way up to the full AP CSA exam — one small step at a time.
The Compass Tutor is built to teach, not to hand over answers. The biggest difference is context: the tutor already knows exactly what lesson and question you're working on — so it doesn't just give a generic explanation, it guides you toward the specific concept you're missing with hints and questions. With ChatGPT, you'd have to explain the whole problem yourself first.
Aman Henok. Scored a 5 on the AP exam and built CSA Compass to be the resource he wished existed while studying for it.
We store only what's needed to save your progress — and your name and email if you choose to sign in. We never sell your data. Read the full details in our Privacy Policy.