Is it possible to cure memory problem and limited mental capability that is hereditary?

You can always improve your brain. For instance, my husband had lots of trouble learning to read and do math. So he compensated by using his memory far better then a normal person. He worked hard at that. He now remembers if he chooses, dialogue the first time he hears it. It's really weird to hear him say the lines to a Commercial that he saw only once. Then I have a dear friend who at the age of 12 was shot in the head and pretty much destroyed 1/2 of his brain. He somehow was able to regrow some of his injured brain cells and now can function pretty well, considering. So whatever your weakness is, keep practicing to improve it until you are happy with the results. It can be done.