beyond (one's) ken

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
Roxana	rahk-SAN-ə (English), rok-SAHN-ah (Spanish)	English, Spanish, Romanian, Ancient Greek (Latinized)
Jem	JEM	English
Buenaventura	bwe-nah-ven-TOOR-ah	Spanish
Keane	-	Irish
Aretha	ə-REETH-ə	English
Trey	TRAY	English