Physics B

Hey Guys! :D

Well I need to take the course exam in a few weeks, but I really do want to jot all the forumlas down for the following categories:

Waves
Electrostatics
Electric Current
Magnetism

I have most of the formulas, but they aren't correct according to my teacher. So I want to ask kindly if anyone knows any like shorter formulas. Like I know that ne = DeltaQ, and such. If anyone knows of a website where I can go review all these topics that would be super appreciated, also not a course just a review. <3