Similar in premise is “The Mirror of Maybe” (slash warning, never-updates warning) in which a fifth-year Harry is shown a hypothetical future and uses the extensive knowledge gained thereby to ditch school, disguise himself as an adult, and become the greatest Gary Stu of all time. Slightly AU magic system and, as I warned, it never freakin’ updates.
Similar in premise is “The Mirror of Maybe” (slash warning, never-updates warning) in which a fifth-year Harry is shown a hypothetical future and uses the extensive knowledge gained thereby to ditch school, disguise himself as an adult, and become the greatest Gary Stu of all time. Slightly AU magic system and, as I warned, it never freakin’ updates.