Systematic grade inflation across the country has made GPAs a poor indicator, and not all schools have the same grade systems. Some schools even allow students

Systematic grade inflation across the country has made GPAs a poor indicator, and not all schools have the same grade systems. Some schools even allow students to take AP/college level classes for bonus grade points. It's not fair to compare students getting a 4.5 (out of 4) grade points with a student from another school who can only get 3.8 for taking the same AP class with the same results.