The lighter side of ADHD
Image not quite for ADHPeeps but I feel this sort of thing happens regularly for us as well.
I used to be the one weirdo who could shoot an 8 ball of coke and be perfectly calm, at least for a few minutes until it started to wear off. That was a long time ago, and I was just diagnosed a couple years ago.
When I was a kid I read that mint flavorings can help the blood vessels in your head dilate, increasing the amount of blood flow to your brain and therefore helping you do better on studying and tests.
Whenever I have a test to study for or to take, I made it a point to keep some sort of mint flavored candy around, and consistently across the board I have always done better on tests than my peers.
That being said, it is entirely plausible that this is a placebo effect, but I like my placebo and it works for me. Perhaps it will work for you as well.
I developed this unique tea leaf / tree bark mix over 20 years ago, and I could swear it changed my life. I studied for 14 hours per day sometimes and absorbed all my training within a few years. Then the effect was gone.
Looking at it objectively, maybe the trick was that it had just the right amount of caffeine, but unlike pure black tea, not too much at once and with a lot of water. Possibly also compensating a micro nutrient deficit. Could also be complex indirect effects, e. g.: ADHD related to gut biome, additional problems due to bad bacteria / yeast overrepresented, medicinal plants in the mix fighting that, to a mild degree.
Treating digestion problems with medicinal tea in combination with caffeine and love for black tea started the whole idea, IIRC, so it's not entirely impossible.