Besides drinking coffee, what can i do to stay awake during school?

Get enough sleep!: Rather than consume caffeine to stay awake, get enough sleep whether it's 6hrs or 8hrs. Find out how much rest you need so that you don't need a nap the next day. Avoid heavy carbs at lunch. Exercise (even if only briefly) to avoid mid-afternoon lull. Sometimes a few jumping jacks, short walk, some pushups/chinups are all you need to get blood flowing. Stretch (discretely) & ask questions in class.