PatrickJMT
KhanAcademy
HyperPhysics
practice, practice, practice
concepts, concepts, concepts
Every equation you see in lecture you should be able to explain in precise terms (what the hell is a derivative anyway? What is integration?) using words. Inb4 flame but sometimes this means grinding very slowly through a proof of the equation, which for the fundamental theorems of calculus are not very difficult luckily. You should be able to derive on your own any relations between linked equations (all the equations of motion from Newton's second law; bonus points for doing it in different notations). You should also understand how any two equations are conceptually linked (the torque equation looks a lot like Newton's second law, why is that?) as this will lead to even deeper understanding of the concepts (what is mass? why do things like Gauss' law and gravity scale with the exponents they do and not some other arbitrary exponent?).