<p>@manas1997 GPA is just a cumulative average. There are different ways to scale it. For example, imagine if all of high school was just one test. If you scored a 99 on the test, then your gpa would be 99/100. At some schools, they have a 4.0 scale which is just a conversion of the 99/100, based on conversion factors, a 99 may be a 3.9 or a 4.0. Also, in the US, at most high schools, different courses are weighted more heavily in order to benefit students who challenge themselves. For example, at my school, an AP course has a weight of 1.15 rather than a 1.0. So a student who does slightly better in a normal course than a student in the corresponding AP course may not necessarily end up with the higher average or GPA. </p>