be beyond (one's) ken

To be advanced beyond one's ability to understand or make sense of the subject matter or task at hand. The stuff they're teaching in this advanced math class is beyond my ken.

Common Names:

Name	Pronounced	Usage
Jozefien	yo-zə-FEEN	Dutch
Baltimore	['bɔ:ltimɔ:]
Juro (1)	-	Croatian
Mubina	-	Arabic
Dan (1)	DAN (English)	Biblical, Biblical Hebrew, Hebrew
Zola (1)	ZO-lə	English