I am about to perfect chronomancy
Behold my power, i am a genious, i figured out how to cram in as much study time before exams. Ive cast a spell, the first part, which will create a "lock" on this exact place and time, in 20 years ill cram in all my study work and then cast the second spell, thatll bring me back to this time, merging with my previous self.
Its so simple, so elegant, i dont know why others havnt done this before?