Flunked in
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(slang) - To be stuck at a university because your grades are too low for any desirable school to want to take you as a transfer student. Not to be confused with [flunking] out, since you are still at the school. However, many students who flunk in eventually [flunk out], and most students who have flunked out [flunked in] first.
Flunked in meaning & definition 1 of Flunked in.