Beginner's Test For Infinite Power 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.nl fastest updating comic site. The Summary is

After Simon, the prince of the kindom of Ainz ,lost his father and his entire family name due to the betrayal of a trusted aide, he was taken in by a knight as an adopted son. However, on one fateful day, the knight’s entire family was annihilated and his sister became missing. In order to find his sister, Simon goes on a path of vengeance…