Oh thank you for this informative thread! My sims usually get A+ even when I try to make them do less such as skip homework, not do all the homework or something small because I don't want them to completely fail anyway :D Just a little bit worse grade would be fine. Now I think they do so well because they probably have very high skill levels (born-in-game sims who usually go to study something they are already interested in). I could try skipping all the homework and see how that affects, or perhaps someone could skip a whole class next time >:)