https://www.mangago.me/read-manga/summer_season/
I think this one is college, but other than that is exactly what you’re asking for!
https://www.mangago.me/read-manga/green_apple_paradise/
https://www.mangago.me/read-manga/unriped_expression/
https://www.mangago.me/read-manga/guang_xiang/
https://www.mangago.me/read-manga/heesu_in_class_2/
https://www.mangago.me/read-manga/cherry_blossoms_after_winter/
pleease i need recs for a bl, enemies to lovers and slowburn, preferably in a highschool setting