Hell Class (Kelas Neraka) is a Manga/Manhwa/Manhua in (English/Raw) language, Webtoon series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

I'm Kenaya. Just an average high school student that wants to play safe from bullying. But those savage bullies harassed my best friend, Riska. Because of that, I came back from hell to punish and humiliate them in this world!