Gomi Ika dato Tsuihou sareta Shiyounin, Jitsu wa Zense Kenja desu: Shijou Saikyou no Kenja, Sekai Saikouhou no Gakuen ni Kayou

One day, Gald, a servant of the Earl's family, was framed for a crime he did not commit and was fired from his job. "You're worse than trash! Get out of this house immediately!" Expelled from the Earl's family and with nowhere to go, Gald saw a flyer recruiting students for Remillion Magic Academy and decided to take the entrance exam in the royal capital. It was said to be the most difficult exam to enter a magic academy, but Gald passed it with ease. How could this happen to Gald, who was just a servant?! Yes, in his previous life, Gard was actually the "strongest sage!" The strongest sage is unrivaled! A thrilling reincarnation story! (Source: Kodansha, translated)