Cramming just before an exam can (in theory) allow you to remember information in the short term and enable you to take in enough information for the exam. However, this may will most likely mean that you'll have no lasting connections to the knowledge, and you won't develop any deep understanding of the information.
Cramming just overwhelms your brain so you’ll end up forgetting half the stuff the next day and you brain will be too tired so you won’t be on your game for the test
