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Tips to manage test anxiety -Take a look at your diet
What to eat to improve memory and concentration

Consume more complex carbohydrates, such as fruits (including oranges, pears,tangerines, grapefruit, apples, and kiwi) and some vegetables.
 high-protein diet, including, cheese, beans,eggs, meat, and nuts. Add protein foods in the morning and snacks for better concentration. [...]