mug up vs cram

mug up and cram both are verbs.

Word	Noun	Adjective	Verb	Adverb
mug up	No	No	Yes	No
cram	No	No	Yes	No

As verbs, mug up and cram are synonyms defined as:

Other synonyms of mug up include bone, bone up, drum, get up, grind away, swot, swot up.

mug up (verb)	cram (verb)
study intensively, as before an exam	prepare (students) hastily for an impending exam
	study intensively, as before an exam
	crowd or pack to capacity
	put something somewhere so that the space is completely filled