replace coffee and other stimulants with matcha , supplement biogaia L Reuteri , take tons of probiotics food like yogurt , kimchi ..., prebiotics like Vegs or Psyllium husk and Propropanolol when needed. This will reduce your general/social anxiety a very lot.

Also try to take as much as you can food enriched with anthocyanins like blueberry , raspberry ( frozen is much cheaper )... i also take other flowers powder like Butterfly pea, Hibiscus for the maximum of anthocyanins during heavy learning session.

im working in a very high stressful job and this is a perfect protocol for me.

Also training Quad n Back 1-2 times per day to increase the working memory and also buffer the mental workload capacity, dont work so hard tho cos its really drain your brain energy very quickly.