How can i increase my concentration during studying? i don't want any pills, i just want to know if there is some type of food or ways to get ambition

Interest: It helps to be interested in what you're studying. This makes concentration a whole lot easier. Check to see whether the courses you're taking move you towards your chosen goal, or not. If they do, it may inspire you and give you "ambition." if not, make adjustments. Also you can make sure to get enough sleep every night, with consistent sleeping and waking times even on weekends.