what is a good way to learn chemistry and math?

what are some good ways to learn chemistry and math at a masters graduate level? I just dont want to end up with a bad tutor and no help from the teacher. are there any better resources then UC ervine lectures? on thoes videos I cant hear the professor that well. I love professor leonard but all thoes videos are too advanced for me. I hate that with math you cant just memorize everything and get by. I suck at understanding the concepts. I cant get stoicheometry and ICE tables and anything in calculus. I get basic algebra. I want to go back to college but I dont want to fail out. I can only afford to go part time so every class is very important.