A lot of people keep turning up asking the same basic question over and over again.
I would appreciate an authoritative stickied - "Brain Training - The Facts" post by someone knowledgeable about the scientific literature like gwern , and better still make it a stickied post in the group so the same query isn't asked over and over.
As for OP :-
* Proper sleep and meditation for a good state of mind.
* Exercise
* Piracetam
* If you want to get better at something - Practice.
Yes , TL;DR - I've been investigating this for a while and I haven't been able to find any magic bullet. It's possible that there may be some cognitive intervention that really works but requires long gruelling practice. For eg: Most of the n-back studies have people playing n-back for half an hour a day at most for around two months, and then test their IQ. It's too much to expect that such a simple exercise could boost IQ significantly in such a short span of time . So while we can't rule it out , there is no magic bullet.
Gwern has written an article on why it may not be possible to improve "g" -
I assume his views haven't changed. In fact he's probably more certain about the above thesis.