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Short term memory loss of events prior to and after a seizure is very common. Some people eventually get some memory recall, while others lose it forever. It may be wise to study thoroughly, over a period of time rather than cramming, and take notes.
If a seizure occurs very close to exam time, and you do have memory loss, most education institutions should make allowances and have exemptions from the exam on medical grounds or have special conditions to allow you to take it on another day.
Remember to try to avoid seizure triggers such as sleep deprivation, stress and excessive caffeine or stimulants.