Schools have sequences for math, but they aren’t all the same, so the videos may have covered different material than your class will. The key is to learn all of it really well.
It may be an easy A – or it may not – but particularly if it is, you’ll have more time to play around with, think about, and master concepts that will be valuable to future you.
It’s easy to think that AOs are impressed by kids who are advanced, but I really don’t see it making a difference if it involves skipping critical material or comes at the cost of a lower grade.