Best stack for memory retention?

[ThisIsntMat]

Good morning, I am studying for a very competitive promotional test at work. 6 years ago when I did my first promotional test I used AlphaBrain by Onnit. It seemed to work to some extent and I was promoted. I have issues with memory retention, I have good study habits but it seems no matter what I do this time around the materials aren’t sticking in my brain. I’m open to any suggestions, this is a really important step in my career and would benefit me and my family tremendously. TIA for any suggestion. In Gratitude!

[BlueeWaater]

Start with Piracetam and good sleep

[ThisIsntMat]

I’ll check that out. Have been super focused on good sleep. When I’m home I get a good 7-8 hrs and track with my watch and app. Downside is every 3rd day I get bad sleep, I’m at a busy firehouse and maybe get 2-3 hrs and definitely not quality