Experiencing short-term forgetfulness during exams is very common and usually caused by high stress, lack of quality sleep, or poor study techniques (like passive reading). It is rarely a serious medical condition. Before trying medicines, prioritize 7-8 hours of sleep, stay hydrated, and practice spaced repetition. For supplements, you may consider Omega-3 fatty acids, Vitamin B12, or Ginkgo Biloba to support brain health, but only after consulting a doctor to check for actual deficiencies. Avoid prescription stimulants without medical supervision. If this persists, a simple blood test can help identify any underlying issues.