Dosing and recommendations for my memory stack?

Hello, after doing my research and taking suggestions from this subreddit and others I have come up with the following stack:

pramiracetam, tak 653, Tropisetron HCl, nsi 189, prl 853.

The goal of this stack is to maximize memory retention and how fast I can memorize information and how long i can keep things memorized for.

However, I am not sure of the dosages for each and when I should take them, as in everyday (need time to build up to have full effect) or when needed (acute). I only study 2 to 3 times a week, 10-12 hour sessions due to work. So any help with the dosing is appreciated.