What does 'cram' mean?

[Crammy]

English Language Tests, Intermediate level

ESL/EFL Test #182 "Who wants to be a millionaire?", question 5

There are many stories about people who couldn't ......... how to be rich.

(a) teach
(b) cram
(c) learn
(d) revise

English Language Tests, Intermediate level

ESL/EFL Test #182 "Who wants to be a millionaire?", answer 5

There are many stories about people who couldn't learn how to be rich.

Correct answer: (c) learn
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what is cram?

[Yankee]

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You can find the definition(s) of the word 'cram' in lots of dictionaries by clicking here.
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"Nearly all men can stand adversity, but if you want to test a man's character, give him power." ~ Abraham Lincoln