How do you get a 4.8 grade average Instead of 4.0?

A 4.0 GPA is typically the highest possible grade point average using a standard grading system where A=4.0, B=3.0, C=2.0, etc. A 4.8 GPA is not possible within a standard grading system. There's no letter grade that would equate to a numerical value above 4.0.

Some schools or specific programs might use a weighted GPA system. This means that certain courses, like AP, IB, or honors classes, are assigned a higher weight than regular courses. For instance, an A in an AP class might be worth 5.0 points instead of 4.0. This allows a student's GPA to exceed 4.0. Even with a weighted system, achieving a 4.8 GPA would require an exceptionally high number of A's in weighted courses, and is still unlikely.

Therefore, a 4.8 GPA is likely a misunderstanding or a result of a very unusual and specific grading scale.