Just break it down. Look up the article on this website called "how to pass teas" or something like that. It breaks down every little thing you should know. I did the same thing. When you stumble upon the post it may seem like its a lot, but it's really not. Once you make your study guide and everything, just focus in and study. Ditch your friends, tv, partying, and everything else that's going to distract you. You can go back to all of that once you crush the test. Also look up crash course, Bozeman science, and khan academy for science. Those guys are the BEST for learning science. They could teach dna replication to a kindergartner with their teaching ability. Trust me just focus on the ati book, the long post on this forum I told you about, and those YouTube channels and you'll be okay!