How to deal with too much info?

Sa mga nag ttake ng boards, paano nyo po naalala lahat ng mga concept each subject ng hindi namemental block during exam? Ako kasi undergrad palang pero feeling ko malaking problema talaga to in the future kasi pano ba naman, yung discussion naming nung prelim naintindihan ko naman, pagkatapos makuha yung cutoff grade parang nalilimutan ko na kaagad kasi may bago nanamang aaralin plus im dealing with multiple subjects pa. Any tips would greatly help for this fcpa 😔🙏