Proximity of the instructor is important. Sit as close as possible to the instructor to minimize distractions. Look at the instructor, not around the room. If your eyes wander, so will your mind---and before you know it, you will be thinking of something else and will miss important information. Keep your pens or pencils within reach and have your notebook open when the lecture starts to avoid having to search for them during the lecture.
Listen for clues to main ideas. The instructor will use cue words such as, "This is important," or "for example," "finally," etc., to let you know he or she is about to present a main idea. Write down all comments that follow cue words and listen for supporting details to add to the main idea. Other cue words to listen for are "in addition," "above all," "in conclusion" and "for these reasons."
Be aware of emotional responses to the material being presented. If you do not agree with the instructor, it will not help at this stage to become angry or resentful. Keep taking notes, and after the lecture is over make an appointment to openly and honestly discuss your feelings. Keep an open mind, both during the note taking and the meeting after with the instructor.
Be sure you are rested and not hungry when you come to class. Being tired or hungry is distracting and could prevent you from fully concentrating on the lecture. You need to devote your full concentration to the lecture, but if you find yourself becoming bored, add your own ideas to your notes. This will give you something to discuss with the instructor or classmates after the lecture is over.