Is High Score hentai?
No
Rated PG-13 (Teens 13 or older) on MyAnimeList and not tagged as Hentai.

TV · 2011 · 8 episodes · PG-13 - Teens 13 or older
Comedy, School, Shoujo
A school comedy with violent and blue jokes. Fujiwara Megumi is a beautiful high school girl but has a selfish and violent character. She has a boyfriend named Matsumoto Masamune, but she often goes around with other boys, who end up as victims due to her selfish behavior.
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