answer key score

Getting 100% on a test, quiz, etc.

Best to avoid saying this in front of teachers as they may end up thinking you actually cheated with an answer key.

Can also be said "answer key marks/test score/score". Or just "answer key".

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"Holy shit! You got an answer key score on that math final?! Why didn't you help me study?!"

"I did, you tard, leave me alone."