Anyone who has bad memory due to old age or a child who is not intelligent in studies do the following:

Darood/Salavat 11 times

Surah Nisa..Ayet no 113. Read it 131 times

Darood/Salavat 11 times

Every day and do dam (blow) on water and drink it. Do it for at least 21 days. Memory will improve considerably and you won’t forget anything you study or read.