You can try to read signs like his behavior when he is near you. Check whether he keeps trying to get your attention or smiling at you. Observe if he is giving you more time than his closest friends. Compliments are also a good sign that he likes.
No way to find out for sure without telling you like him and asking if he likes you back. hints might be if he follows you on Instagram or twitter, smiles at you in the halls, texts you a lot, or compliments you a lot
Look at the signs. He may be looking at you in class or he may be discussing you with the other guys. The signs are unmistakable. If he talks to you in class or in the halls that's a good sign. Listen around. You'll find out soon enough.