I disagree entirely with whoever said you shouldn't write everything the professor says because it distracts you. That is a completely personal quality that depends on your listening skills. Learn if you are the type who remembers things they heard or if you are the type who remembers things they write down. If you really can't listen and write everything, record the lectures and write the notes later. A complete set of notes is what has saved me in every class in college, because it's very useful when you use the tip I'm about to give you...
This is something my Biology 201 professor told me before the first test. I have used it in every single subject since and it has been amazing: before a test (several days before... not the night before), go into your room, shut the door, have a dry-erase board/mirror/chalkboard at the ready and teach your fish/dog/bed/teddy bear/dresser all the material. Give every single lecture as if you were teaching a class. It's sort of embarrassing at first, but you get the hang of it quickly. Trying to explain something out loud pinpoints precisely what you do and do not understand, so you're not staring at your notes passively thinking, "I'm pretty sure I get this." You are actively testing yourself to see if you understand. Obviously, the goal of this is to be able to explain everything on your own, only using the notes to carry you from one topic to another.
Hope that helps!