Choosing a Major A major is a concentration of courses in a specific academic subject or professional field, and it is something many colleges require students to declare at the end of their sophomore year. Some students know what they want to major in before they even leave for college; however, many students are initially unsure. To help decide what major you should choose, consider the following steps: Do some self-evaluation. Think about what you really love and what you’re good at; majoring in something that interests you and that you have a natural knack for will come more easily and be more enjoyable.