Your teacher will direct you to readily available sources. Other sources include Internet and CD-ROMs. Do not waste time looking for the latest information in an area adequately covered in the references at your fingertips. A text, a dictionary and an informed teacher. You will already know several terms from general science, health and physical education.
Many students also seem to lose their command of English.
Don't forget what you already know - respiration means the same in every subject. Photosynthesis, cellular respiration, cell structure, genetics, evolution - such terms are the basis of the study. They are now put into a context and their role in the structure and function of organisms explored in greater detail. One area that floors students initially is the study of disease, specifically the body's responses to invasions. A practical hint is to construct your own glossary.