learning and forgetting things quickly

Hello po has it ever occurred to you na ang bilis mo mag memorize ng stuff for example exams and tests (mostly bagay na hindi ka interested either consciously or subconsciously) like stinress mo sarili mo to learn information and after the "exam or tests" once na nakapag relax utak mo suddenly makakalimutan mo lahat ng inaral mo... Is that normal po? Huhu