The verb cram has 4 senses (first 1 from tagged texts)
1. (1) jam, jampack, ram, chock up, cram, wad -- (crowd or pack to capacity; "the theater was jampacked")
2. cram -- (put something somewhere so that the space is completely filled; "cram books into the suitcase")
3. cram, grind away, drum, bone up, swot, get up, mug up, swot up, bone -- (study intensively, as before an exam; "I had to bone up on my Latin verbs before the final exam")
4. cram -- (prepare (students) hastily for an impending exam)