Wiktionary
cram session
n. An intense period of study, sometimes all night before a critical exam.
Usage examples of "cram session".
Yet somehow, without a single cram session -- or, for that matter, a single exam session -- that she could later recall, she passed all her classes.
The night before Daniel rode up to Cambridge to begin his four-year Cram Session for the End of the World, he slept in his father’.
After one of these meetings, and with the end-of-semester exams looming, Skip went to the Bear's Den to meet his Anthro tutor for a coffee-fueled cram session.