<p>GPA can be altered in so many ways based on who you are(personality, school type, teacher, how teachers think of you) Note: GPA does not mean Courseload. </p>
<p>SAT can not be changed. You can go to a terrible high school, be rank 1 and have a 4.0 GPA, but that can be equal to a hard-worker who has a 3.7 and is ranked 20th because his school is extremely competitive. That’s why GPA or rank is really not useful. </p>
<p>SAT, on the other hand, is much better, albeit not perfect in any way, at comparing students all over the country. It is true that luck and income can influence one’s score, but it is not as much of a difference as what GPAs tend to have.</p>