TH: How I study during the vacation

I often study English at my part-time job during summer vacation. I teach English to my students in cram school. I can do a review of English. They are junior high school students or high school student. I like to teach English to junior high school students, but I am not good at teaching English to high school students. Because high school's English are more difficult than junior high school's one. I have to study high school's English again. And I sometimes study English for TOIEC. I want to get high score before I got it. (100/519 words)