Facts you learned for a test fade. The habits of thinking you built while learning them tend to stick around.

Content and capacity are not the same thing, and only one of them survives the exam. Dates and formulas drain away within a year, while the ability to break a problem into parts, to check your own answer, to sit with being confused, stays. You were being trained more than informed, even when it did not feel that way.

Pay some attention to how you are working, not only to what you are getting through. Notice what you do when you get stuck and whether it helps. That habit transfers to every subject and every job you will have.