Studying (or lack thereof) can really affect your grades in all levels of schooling. You need to study for tests, no matter how much you don't want to. Studying is the key to doing well on any type of test. So many students will not study at all or do the 15 minute cram session on the bus on the way to school. To get the maximum benefit out of your studying, you need to start several days before the test and study the material in short bursts. Seriously avoid cramming since that is not very beneficial for remembering things.
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Well, I know at my school, a lot of people are missing last period to leave for a sporting event. That's not good, especially in math, because you can get behind and not understand a thing.
Also, you could stay out late for games and practices, causing you to get less sleep, less studying time, and less time for homework.