What is the highest GPA you could achieve if your school allows for weighted credit?

The highest possible GPA with weighted credit depends entirely on the school's weighting system. There's no universal answer.

Some schools might weight AP or IB courses as a 5.0 or even higher while others might only add a point or a fraction of a point. Therefore, if a student takes *only* the highest weighted courses and earns an A in all of them, their GPA could theoretically be far above a 4.0. The maximum would depend on the specific weighting scheme used by that particular school.