Hogwarts: Reborn as Harry Potter

A man dies and wakes up as Harry Potter in the cupboard under the stairs—but this is no passive chosen one. With memories of a past life and a far more practical mind, he begins studying magic early, questioning the rules of the wizarding world, and refusing to follow the dangerous path fate seems to have prepared for him. Smarter, more cautious, and determined to survive, this Harry plans to rewrite the story instead of being crushed by it. — Description from novelcodex.org