I would definitely recommend Infinite Jest, it's my favourite book ever. If you have a stressful school schedule, though, you might find it tough to find enough energy to finish it-- it's a serious amount of work but it's well worth it in the end. I'd actually recommend anything by David Foster Wallace, try his essay collections for some of the lighter stuff. Also worth checking out: A Heartbreaking Work of Staggering Genius, Blood Meridian, White Noise, Europe Central, Lolita.