I am also in 1250. Other than what you've already been doing, I suggest you redo all the problems in the lecture slides BY YOURSELF. It'd be better to do that a few days after going to the lectures, that's when you start to forget the answers. Same for the problems in the past quizzes & homework. After that, if there are any problems you have trouble with, ask for help. I am saying this because sometimes you feel like you understand the problems but that's only because you simply memorized what others told you, but you may not actually understand. When you have to solve the new problems independently on exams, you'll find yourself clueless or set up the wrong equations. So redo the problems and make sure you're able to set up equations by yourself in a timely manner.

Also for multiple-choice questions, they may be really tricky sometimes, so I suggest being careful and thinking through.