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You should really try Kaguya-Sama Love Is War, i feel like that's the peakest of highschool life there is. The romance actually goes somewhere, trust me it'll be the best 3 season you ever had

I don't know if this list will fit the vibe you're going for completely but a few high school centered animes, shows, and movies I can think about are:

• Puella Magi Madoka Magica and Madoka Magica: Magia Record. More related to magical girls than high school but they're mostly around those ages. Idk

• Charlotte. Again, magic and power but they're high school students. Slight romance at the end, but not too much

• Yowamushi Pedal. Cycling anime, really cute

• If Wishes Could Kill. A K-Horror series, the name says it all.

• Assassination Classroom. A misfits class gets trained to assassinate their teacher. 

• Deadly Class. High school for assassin teens.

• Tomodachi Game. High school group forced to play mind games to clear debt. 

• Weak Hero Class 1. K-drama about a smart, quiet high fighting back against bullies.

• Extracurricular. High school kids getting wrapped up in illegal business. 

• Night Has Come. A class gets forced to play a deadly real-life Mafia game. 

• Friendly Rivalry. Elite girls' high school with academic and social competition. Implied romance between the main characters.