A Barbarian Was Admitted to the Academy 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

Lee Soo-jin, a college student who loved playing a role-playing game called “Academy of Magic”. One day, he wakes up in the body of Rina, a secondary character in the game who was a barbarian warrior from a savage tribe. He discovers that Rina was destined to come to a bad end, being captured and tortured by the evil empress. She decides to escape this fate and enroll in the magic academy, where she meets several characters from the game, including the crown prince, the black knight, the white wizard and the empress herself.