3100 Shenandoah St, Houston, Texas 77021, United States
If you don't understand something, you should ask the teacher during lunch. Do the notes when he assigns them; there will be a quiz on the notes, usually the next time you see him. Pay attention to the lectures; sometimes he says things that aren't in the textbook but are in the test. If all else fails, watch the Amoeba sisters' biology videos on YouTube.