Too many retarded niggas overcomplicate nootropics or end up buying junk, assuming your goal is studying, the main pillars you should cover for your first stack are:

Stimulant: modafinil, KW-6356, phenylpiracetam, pemoline, methylphenidate

Memory: TAK-653, ACD-856, PRL-8-53, BPN14770

Executive function: tropisetron, piracetam, pramiracetam

By far the most important thing is getting a stimulant that works well for you

(((this is an reasonable simplification, i cba making a massive post rn but i had some nigga ask me about nootropics so i figured id just make a post)))

(((there is also a good amount of mechanistic overlap between pillars on this list, for example pramiracetam also has an AMPA PAM action like TAK-653 among its others)))