The trick is to begin your search early and break the application process into simple pieces.
When you test, you'll spend 3 hours and 45 minutes completing 10 sections: The reading section has 67 multiple choice questions, math has 44 multiple choice and 10 grid-in, and the writing section has 49 multiple choice questions plus one essay.
Each section is scored on a scale from 200 to 800, with the highest score possible being 2400.
You can also use sample test questions from College Board.
This test, officially the Preliminary SAT/National Merit Scholarship Qualifying Test, is designed for high school sophomores and juniors, though you can take it as early as middle school or as late as senior year.