Someone in my lab is struggling with it, and so I asked him how he was studying. He downloaded the instructor solutions manual and he has that open while he's doing the practice problems.
If that's what you're doing, and I'm not saying it is, it needs to stop. You have to know how to set up the problems yourself. There are only so many permutations of questions they can ask you to solve. If you know how to set up the problem, that is half the battle. Start with a diagram if necessary, list your knowns, isolate what they're asking for - the unknown, and think about what equation(s)/steps you need to do to solve it, how you may need to rearrange the equation(s), and solve on your own. I can't stress how important that is to be able to set it up, realize what they are asking and what information is needed and what is not.
Sometimes, too much information is given in the problem to trip you up, but read it carefully and you can figure out what is the meat of the problem and what is table dressing.
[Edit: It helps to be able to see relationships, which is usually easy when you know the equations expressing the relationships, i.e. what's directly proportional to what, inversely proportional to what, and to what factor. If it's multiple choice, there are a lot more conceptual questions thrown in usually, where they say if x is doubled, what is the effect on y, when y is x^2, so if x is doubled, then y is 4 times greater. Make sense?]