Nobody likes to work, not even adults! Studying is a student's work.
However, if you want to succeed, you need to learn how to make yourself do it. Here are some reasons to study:
If you study, you will learn the material and pass the test or class.
If you study, you will learn the material and be able to use it to help with other things later - for example, studying your multiplication and division tables means you can figure out how much something costs or how much of a tip to leave at a restaurant.
If you study, you will learn how to discipline yourself to do something you don't want to do, which will help you succeed in anything in life.
If you study, you will get a sense of accomplishment from doing something hard and succeeding.