 If you liked
Prison School
|
 ...then you might like
Yamada-kun to 7-nin no Majo
|
They have the same sort of humor:
Everything is exaggerated to the max. Student council members are like the big bosses that rule the school. If you break school rules you're basically dead. Kangoku Gakuen is, however, much more graphic and daring.
TL;DR
Same kind of humor, Kangoku Gakuen is just much more hardcore in every way.