A person needs to learn both knowledge and moral principles in order to be useful and upright. These are the basic qualities he needs to survive in the society and to make further achievements.
Schools are places where one can learn useful skills and get to know the meaning of life. By studying at school he acquires many abilities such as how to write and speak properly, or how to solve math problems. One also learns to distinguish right from wrong.
In this way, it is very important for a person to go to school. As we all can see, going to school is the best way for people to acquire what he needs.