So, does cramming for math tests work? Yes and no. In the short term you may be able to pull off a better grade but in the long term when you need to recall all that information you will fall short. It's just like the story of the turtle and the hare...slow and steady wins the race. When midterms and finals roll around students flood the libraries, study halls, and coffee shops. If you are keeping up with the material throughout the semester you won't have to participate in this ritual, you can just do a light review and you will be ready to go. Again, let's do the math. Crammimg 20 hours of studying into a couple days before the exam is no match for an hour a day spent studying for 15 weeks. Furthermore, intaking the material in small chunks over a long period of time will better allow your mind to digest, assimilate, and remember what you have learned. So if you are a 'crammer' consider trying the slow and steady approach.
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