I have been learning a lot of the Math in parallel with Physics so I'm not sure how many of my issues are Physics issues or Math issues. I feel like some of my Physics issues could be Mechanics issues. Is it better to retake Mechanics or move on to EM 2. If I do take EM 2 I'm wondering specifically about what Math concepts I can go over to prepare. I felt very unprepared for solving second order non-linear partial differential equations in EM 1 since we only go up to ordinary differential equations at my school. Also, would taking a Math Proofs class help me in Physics? Because of all the derivations?