above (one's) head

Being too advanced or difficult for one to be able to comprehend, understand, or complete; beyond one's abilities. I thought I could handle this advanced math class, but the stuff we're learning is just way above my head.

Common Names:

Name	Pronounced	Usage
Cassiopeia	ka-see-ə-PEE-ə (English)	Greek Mythology (Latinized)
Jonathan	['dʒɔnəθən]
Miraj	-	Arabic
Vahid	-	Persian
Curt	[kə:t]
Garnette	-	English (Rare)