This is the school where I attended back in my country, Korea. Since Korea is small country compared to US, it is usually built five to six story level high. For high school students they have tons of studies to do so after classes which ends around 3pm ~4pm. There is a free studying period untill 10pm and 11pm for seniors. It is not mandatory but some teachers forces students to be at school and study for college enterance test.
Starting from year, students are assigned to be in one classroom and stays for rest of the year. Students get much more closer than schools in America which they move around classes. In Korea, teachers come to the classrooms.
Since students have tons of study to do they do not get enough sleep plus this is the times when this age sleeps alot. so when its break time for 10minutes, alot of them sleep.
School uniforms are mandatory and it’s quite good for students to wear and not distracted from fashions.