If your experience is complicated, you can write a brief introduction. At your age, the general experience is relatively simple. Most of them started in primary school. You can write it like this. When and where to go to primary school, when and where to go to junior high school, when and where to go to high school, always write about you now. Including the time and place of study, but also the time and place of work, and sometimes you must write a letter of recommendation.