AP Computer Science Exam Review and Free Response Practice Problems

2012 AP CS Exam Free Response Solutions

AP Computer Science Practice Problems by Topic

Each section focuses on an AP Computer Science Exam topic that has been tested extensively on previous exams.
All problems were created by AP CS Tutor Brandon Horn.

Featured Practice Problem – CandidatePool

Return matching elements from an ArrayList
Find an extreme in an ArrayList
Remove matching elements from an ArrayList

Try my CandidatePool Free Response Practice Problem

GridWorld: The AP Computer Science Case Study

Practice with Location and Grid
Write a complete subclass of Critter
Use Grid to implement a game

See my GridWorld Case Study Practice Problems
See my GridWorld Case Study Explanations
See my GridWorld Case Study Solutions

Inheritance & Polymorphism

Design and implement subclasses
Override superclass methods
Work with abstract classes and methods

See my Inheritance & Polymorphism Practice Problems

2D Arrays

Traverse a 2D array in row-major order
Fill a two dimensional array
Visit specific elements of a 2 dimensional array

See my 2D Array Practice Problems

Lists & ArrayLists

Compare consecutive elements of a List
Remove specific elements from a List
Find the maximum in an ArrayList

See my List & ArrayList Practice Problems

Sorting & Searching

Code selection sort, insertion sort and merge sort
Identify and complete variants (ex: back to front)
Determine if an implementation is correct

Try my Sorting & Searching Practice Problems

Recursion

Trace recursive methods
Implement recursive methods
Determine the purpose of recursive methods

See my Recursion Practice Problems

Additional Practice Problems by Topic

Solutions to AP Computer Science Exam and GridWorld Case Study Problems

Multiple Choice Solutions for Released Exams

2011 AP CS Exam Free Response Solutions

2010 AP CS Exam Free Response Solutions

2009 AP CS Exam Free Response Solutions

AP CS GridWorld Case Study Solutions