Spew-it-knew-it theory

Spew-it-knew-it theory says that students commonly retain a lot of information for an important test/exam but then mostly forget about it once they don't need to know it anymore.

Believe it or not this has actually been backed up by real research by Hermann Ebbinghaus.

Test question (short answer): What does the spew-it-knew-it theory say?

Answer: it means that once I know it I'm completely forget about it and everything else regarding the tested information.