How do you get his attention if you have a really strict teacher that doesn't let you talk to the opposite gender?

That's definitely a tricky situation! It sounds like your teacher is a bit extreme when it comes to classroom management. Still, there's hope. Make sure to study, pay attention in class, and finish all your assignments to get on your teacher's good side. Once you're dismissed, try to catch up with your crush once you leave the room. The two of you can bond over how unique your teacher is. Just make sure your instructor can't hear you! You might want to offer to do homework with the guy you like. That way, you two can have a fun and unfiltered conversation once you're off campus.