So I've been using a Barron's Math II book that has been absolutely no help to me. I've been getting 400s on the practice tests, I don't understand any of the concepts whatsoever (my highest math is Pre-calc, got an A). I knew that Barron's was harder than the actual test so I looked online and did some of those practice tests (collegeboard and random sites): still, way too hard! I didn't understand any of it!
I'm taking Math II in October and will be apply to many UCs and CSUs these coming months as a computer engineering major. I NEED to score as high as possible obviously. What should I do? I don't even understand the basics, where do I start? Is there some kind of online (free, preferably) study guide that I just haven't found?