Over one's head

"I don't know the answer to that problem. The subject is over my head."
"Don't bother explaining it to him. It's way over his head."

A: "I have to write a paper on the theory of relativity. Do you know anything about it?"
B: "I won't be able to help you. The theory of relativity is way over my head."

Other Common Sentences

"I don't understand the meaning. It might be too deep for me."
"It's beyond my comprehension, so don't bother trying to explain it."

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