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
Subramaniam	-	Tamil
Reanna	-	English (Modern)
Baptist	-	German
Bedros	-	Armenian
Maximillian	mak-si-MIL-ee-ən, mak-si-MIL-yən	English
Hadewych	HAH-də-veekh, HAH-də-weekh	Dutch