When you have no interest in class material, it affects your behavior, grades, connection to others, and commitment. You will struggle in assignments, tests, and projects, leading to poor grades. It is a waste of time and money, and other students could use that seat. Classmates will not want to sit by or get help from someone who does not understand. You will have little commitment and may miss classes. Using phones in class can aggravate instructors. Students who are interested get better grades overall.