For focus.. stims like caffein w/ dl-phenylalainine(similar to) with l-theonine. But if you mix with a maoi that is my favorite.
focus xt by sns.
yeah im wont to stay away from stims if i can...
Idk about memory, not sure if any supplement will really live up to what you exepct, but Focus XT is great for focus and studying
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DHA can help with memory and mental focus. If you do not take a multi, that would also be a good start. Ginkgo is also known to improve memory.. as well as a boost in the sack.
I used Sulbutiamine with some sort of fat. Full cream in my coffee was a good source.
Kept me alert while starting a keto diet and i think it had positive memory properties as well.
Try Lucidrol by Advanced Muscle Science.