I've been a year away from math now, one year out of high school deciding what I want to do, and since I've decided on engineering, I know I'm going to have to be doing some serious math. I took math through calc 1 in high school, and engineering programs generally start at calc 1 (or however farther you are), so I'm all set there. Thing is, I know that the math will be getting very advanced in upcoming classes so I'm gonna have to change my method from "learn it so you can do the quizzes and tests" to "learn it so you can remember it and use it in life." Now don't get me wrong, I did very well in math and still consider myself to have good math skills, it's just that I've forgotten a fair amount of the terminology and the procedures. I think I'd be able to catch up just fine if I could have a nice elaborate review, but I don't want to go buy $80 textbooks. What's a good way to catch up on my trig and calculus?