How can I quickly reduce the magicka costs of Alteration spells?

So I found a Spell Tome book: "Telekinesis", in a dungeon and I think it is a Adept or Expert level spell and it takes around 189 Magicka per second. I can only use that spell for like 7/10's of a second with my Magicka completely full on the account with the most Magicka (around 220 or something).

How do I get it so that I can use Telekenesis for at least 15 seconds? Although I have thought of getting the Adept or Expert perk for Alteration that makes it cost half as much Magicka, I think it would still not take long at all to completely run out of Magicka. Also, I have thought of finding an Alteration trainer, but I can not seem to find one.

Solution 1:

One of the most effective ways to reduce your magicka costs is by wearing armour with the Fortify Alteration enchantment. Multiple pieces stack- you can wear armor, a ring, an amulet and a helmet with the enchantment on it. With a high enough enchanting you can get -25% on each and cast that school for free.

Solution 2:

When I was training Alteration, I always used the Flesh spells like Oak Flesh and Ebony Flesh. The higher the level the quicker it raises Alteration. I usually just stayed by Slaughterfish on the edge of the water while continuously casting the spell. This seemed to get it up pretty quickly. Otherwise I know there is a Alteration trainer in the College in Winterhold, I think his name was Tolfdir or something similar.

Solution 3:

Using Detect Life in crowded places is a pretty easy way to level it up. But if you want some sweet details check out this link:

Skyrim: Unofficial Elder Scrolls Pages

I use that website when I need some tips, it's super useful!