I tend to forget things, and im only 22 years and studying medicine. how can i improve my memory?

Many good options: B vits may help (esp. B12 and L-5-MTHF form of folate). Phosphatidylserine, acetyl-L-carnitine, bacopa, vinpocetine,ashwagandha,gingko,rhodiola,lion's mane mushrooms and piracetam are proven to help. Fish rich in DHA like wild salmon and fruits/veggies of all colors are recommended. Minimize sweets and grains. There are entire books on this subject. A good article is at http://tinyurl.com/hzzryu4