I did this through high school by listening in class, the teachers explained the material then assigned homework, which I did not do, then tests, which I crushed with near 100% accuracy, then got a C grade in most classes because I don’t do the work, only the tests. Also tested out of the first year of college. Was just good at taking tests I guess.

In university though - I did have to study and do the homework to ace the exams. That was more specialized (accounting).