A test you take in high school that could possibly be the largest single factor in whether a university accepts you or not. It has three sections: Reading, Math, and Writing. The range of possible scores on each is 200 - 800, for a possible cumulative score of 600 - 2400 on all three sections. The average score in each section is roughly 500 and the average total is roughly 1500. The test is taken early on a Saturday morning (say, 4 or 5 hours before you would even wake up on a normal Saturday) and you must be at your mental peak for it. Scores are received about two weeks later and then sent to the colleges you're applying to. Most students dread the SAT but they do not appreciate the amount of control over their admission chances that it gives students even in the late phases of high school when their GPAs can't be changed much.
Tom: You just took the SAT? That sucks! I hate that test!
George: Well my good friend Tom, I actually love the SAT. See, my GPA has never been so hot but after putting in a few weekends of work on SAT preparation now I can get a great score and go to a great university anyways.