You can find the Telekinesis spell in Redwater Den. If you have enough mana to cast it, it is the fastest way to level up possible (that i have found). Lift up an object with Telekinesis, then (while still holding it) fast travel as far as you can to the other side of the map. It should instantly max out your Alteration to 100 and level you up many times. https://www.youtube.com/watch?v=sD5-3Hx7hwI
So...
1. Collect the Secret if Arcana power from the Filament and Filigree Black Book and the Telekinesis spell.
2. Equip the power and Telekinesis in your spells menu.
3. Press RB to activate your power and do the glitch from above.