Well, first of all, I'd suggest to brush up a bit on your grammar.
It makes the conversations a bit awkward to read, like this:
He should be saying "Stop sleeping during class" or "Stop sleeping in the classroom".
You might luke to also look into rewriting this as the sentence makes no sense:
Another thing you might like to consider, is that when you show something, make sure that the reader understands what they are looking at.
I assume it's someone's side view from the neck down.
However, it could also be a penis.
This could be easily avoided by drawing all the way down to the hands, or even better, a front view.
This is the kind of stuff you learn with time, so don't despair.
It is clear that you know how to draw, now you just need to learn the language of comics and how drawings and panels interact with readers.
Keep going and it will all fall into place with time.
