I'm a Level D Student 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

In a world where powerful beings are ranked by abilities, Key Academy is a battleground for the elite. Jelack, a mysterious new student, comes in as a bottom-tier Level D student.
As students regularly spar to flaunt their powers, keeping her low rank a secret becomes increasingly difficult. Jelack trains in the shadows, aiming to rise above her D status. With unknown reasons for her transfer and her past shrouded in secrecy, she must uncover her true potential to survive the fierce hierarchy of the academy.
Every day is a fight for recognition and respect, and Jelack is determined to prove her worth.