Secrets of the Silent Witch -another-

After memorizing his magecraft textbook in a single week, Louis is accepted as a scholarship student at Minerva's Mage Training Institution. But surrounded by nobles, the rough and rowdy boy from a poor, remote village is treated as a problem child and feared for the way he trounces his opponents in magic battles. And yet Louis still finds teachers he respects and friends he can rely on as he grows into the man who will become a Sage. Learn all about the notorious deeds of the Barrier Mage's youth in this two-part prequel to Secrets of the Silent Witch.

[From Yen Press]