Because liberal arts can rely on memory and skills, while mathematics needs practice and logic. Mathematics needs a solid foundation and certain ability, but liberal arts is not necessarily. Mathematics is the weakness of many people, so we must find the right direction when imposing exercises. First of all, we should understand the knowledge of textbooks, attend classes, check for leaks and fill vacancies after class, and actively fill vacancies. When it's too bad, it's too late. Don't be impatient in learning mathematics, be patient, stand the blow, study hard, and hard work will always pay off.