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1.
Grade grinding is a term used to define the act of studying for excruciatingly long periods for the purpose of getting a small increase in marks for any assessment/exam, etc.

Often means foregoing eating, socializing, and sleeping for the tiny incremental increase in grade.

Frequently requires the remembering of menial things such as dates, numbers, etc.
John: What were you doing last night? I tried contacting you, but your phone was off.
David: Sorry, I was up grade grinding till 3am. I've got a damn calculus test today and I've got 14 formulae to have memorized.
by TheDunce May 07, 2011