Changing the name has no effect on going to school, just take the household registration book and ID card to register. You have to take both of these things. When you fill in the list, you have a previous name, just fill in the previous name, which generally won't affect.

Introduction to renaming:

Citizens who change their names need to go to the relevant departments with relevant documents. Adults should meet the following conditions when changing their names: first, they express their willingness to change their names; Second, they should have sufficient reasons; Third, we should promise to bear all civil and legal responsibilities caused by renaming.

Refer to the above? Baidu encyclopedia-renaming