cram

[1]	jam , pack , stuff , jampack , ram , overstuff , overcrowd , chock up , wad , jam , fill
[2]	study , burn the midnight oil , (Literary) lucubrate , (Colloq) grind , (Brit) swot
[3]	grind away , drum , bone up , swot , get up , mug up , swot up , bone