[JapanAni]

Kinpachi Sensei (there's a span of 8 seasons of this show that deals with a lot of teenagers and real life issues.) One of the best school related dramas.

Gokusen (I think there are 3 seasons? The teacher is in a Yakuza family and she's hiding her Yakuza family from her work.) Pretty fun and exciting drama.

Koizora is about a young girl in love with a delinquent teen. I haven't seen it yet but I thought it would be fun to watch.

There's tons of drama's dealing with school life just look through dramawiki. It will help what you're looking for.