The SAT exam is not only a test of mental aptitude; it also shows motivation, self-sacrifice, and initiative. If you do well on the SAT, it may be because you have always had good study habits, or it may be because you put forth a great effort. Either way, universities want their students to have those qualities because it means that you have what it takes to graduate. High drop-out levels reflects very poorly on a university, and the school loses prestige as a result.
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