Edit- the video is a little long and rambly. Basically, buy the book, read the chapters well in advance of a test day, do all the practice problems and take your time to figure out why you got a question wrong. If you keep up with your class and don't wait until a day or two before the exams, you'll be crushing undergrad in no time. You'd be surprised how much more you'll remember when you review material daily, even if only for a few minutes.