Site looks fine.You have taken enough care to put material on it but it seems very flashy for an education site.
But any way my suggestion is about adbrite.Adbrite does not pay brother.It even does not serve ads.
Chitika - pays for sure.It serves ads aswell.
Adsense is the best one.But when someone is using adbrite,I say if Adsense is not your cup of tea use chitika,clickbank,inlineads etc.These will pay you better brother.This is my opinion.
What say.
Regards
VVBB
If you find my post useful,Please click the star in the lower left corner to give me some Reputation.