1 - When you have an exam, presuming you have 90 minutes for it, and the paper can be completed in 60 minutes, don't. The only thing you will gain out of rushing is the ability to leave early, but that's not always possible if you finish close to the end. When taking it slowly, you're really relaxed and you have more time to think about the questions. Plus, you can also nap like a pro, and think about the questions subconsciously. While relaxing.
2 - Focus your time on finding loyal friends rather than a quantity of friends. Loyal friends will stay by your side at all times, and you won't regret it if you're ever feeling down.
When you're casually complaining about school with your friends, and then they mention they can drop the subjects they dislike while you have to stick at them even though you're the one who's in a higher grade.