Can’t read the whole thing without signing up… but it seems to me that if you bet on getting an A+ you are going to study like crazy to win your bet…
My dad used to attach pocket money to grades – an A would be worth a certain sum, a B also but less, a C would be worth nothing, a D would subtract half of what was gained by the other grades, and an F would mean you got nada, period. It did work, I sure tried to keep my grades up.