When someone has a temperature, it is recommended to put your hand on their forehead and recite verse 69 of Sura Al Anbiya. It is also recommended to recite Sura Al Asr (103) and Sura Al Shams (91) on water and be able to drink it.
For memory improvement
Recite seven times after every wajib salaa, the extract from Sura Taha, aya 114, “My rabb, increase me in knowledge”.
The concept here, is not to increase my knowledge, but increase me, make me a better person through the knowledge I have. It says, “increase in me” – make me greater with what I have.