Some food Help your brain work better. If you want to improve your memory and school performance, your diet should include a lot of nuts and green leafy vegetables, a lot of milk, Sea food and liver as well as some oranges and cereals. There are also certain food you can eat to give your brain a buzz when you need to keep awake or study, but you have to be careful! A cup of coffee may give you a mental boost, but too much coffee can make you restless and irritable.