Study Group is a Manga/Manhwa/Manhua in english language, Action 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

Gamin Yoon, a 17 year old student, goes to a school known to harbor future criminals. Stuck in a carnivorous environment where only the strongest survive, he struggles to get good grades to enter a 4 year university. But, will he be able to study well enough to enter university, or will he get involved in the unending fights around the school?