there's a source to these quotes but it doesn't come from a 100% trustworthy place. the quotes that come from interviews (printed/oral) that i can confirm are true will be here. otherwise the rest go here. ("overheard quotes")

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"If you’re not good at studying, don’t even think about liking me. EXO may seem like the most important thing in the world to you right now, but in a few years, you’ll regret it. You’re going to be a 12th grader soon and it may be the most important time in your life, so focus more on your studies than us and meet us again proudly in the future." * (orig)