Just makes all the (non-Master) spellbooks available for purchase from the start of the game.
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One of the many problems with Skyrim's underwhelming magic is that you just can't get "good" spells at a meaningful time: even if you're pouring all your levelup points into Magicka and all your perks into casting, you don't have access to spells any sooner than a pure combat build, because availability is only based on character levels.
Oblivion got this right, letting you buy each level of spells once you had the skill to cast them, but implementing that in Skyrim is more effort than it's really worth, so since Magicka and Perks limit you to only casting "appropriate" spells anyway I just took the easy way out.
This super-simple mod changes the leveled lists for the College spell vendors to make all their spells available from level 1. Spell books in loot are unaffected.