Book excerpt: I like Khan Academy.Khan Academy is a fantastic resource for students preparing for their college admissions essays: thousands of free questions written by the makers of the test, answers and solutions to these questions, and hundreds of videos to guide you through the topics. But you don't take the test online. You take it on paper. As such, it can be difficult to use the Khan Academy's materials effectively, since you have to transfer your skills built up on the computer to the printed page. You're going to take the test on paper, and while you don't have to show your work, writing down your work as you go through problems will increase your accuracy and speed on the real test.