In my country there is usually a 10 minute break between classes and in that time you need to use the bathroom, eat a sandwich (if you brought one with you), change class if you have some science class that's being held in a science lab, or change into the sports clothes for PE class. There are no lockers, you just bring what you need for the day ahead in your school bag. Young kids nowadays have trolley type school bags because they are usually too big and heavy to carry on their back. As a keepsake, traditionally people just take a class picture with their teachers at the end of the year or when graduating. Sports is usually speed running or gymnastics type exercises, and for music there's choir if you can sing and music theory if you can't sing. They sometimes organize summer camp during summer vacation and there's usually a field trip on June 1st to some museum, theater, or factory if it falls on a week day.
