The Overachiever’s Black Tech System 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

Using the Black Technology System, the protagonist enters a world of knowledge, where he improves his learning efficiency by a factor of one billion! He becomes the smartest human in existence, gets rich using his super brain… and experiences the loneliness of being a leader.