Learning to study is a trial-and error process and takes effort. The important thing is to be able and willing to adapt your study habits depending on the demands and content of the course content. Orgainizational strategies and time-management must go together with focused study, reading and note-taking.
See the resources below and ask your teacher or counselor for tips:
Khan Academy is an excellent, free resource for the SAT, math, science and other content
Six Reading Habits...... - excellent tips from Harvard
Below are documents from the High School 101 Presentation which covered study skills for 9th and 10th graders.