Start by making sure that you proof read what you write. If you are not sure of the spelling of a word (take exemplary, for example) then look it up. When you are asking a question or answering a question, put your thoughts into a complete sentence. These skills will help you on tests as well as in every day class assignments. As far as methods of studying go, you need to find your own perfect fit. Some people need silence. Some must study while the radio is blaring. Some actually find sucess by moving while studying. Find out what type of learning style you have. Perhaps a book like The Way They Learn, by Cynthia Ulrich Tobias might help. Once you know what type of learning modalities you prefer, you can go about creating an idea situation for your study time. For example, if you are a visual learner, it may help for you to use a highlighter marker to mark your text book. If you are an auditory learner, you may find that going into a private room where no one is bothered and saying your notes outloud to yourself.

I hope this was helpful. Without complete sentences, it is hard for anyone to know exactly what you are asking.