Reddit reviews Zero Sight (Zero Sight Series, Book 1)

Try these:

Zero Sight

Emperor's Edge

Well, the best I can offer that hasn't already been said would be Zero Sight. It's an urban fantasy with university-aged students. However, it doesn't seem to be on audible yet.

Oh yeah, I've also heard The Blinding Knife has a lot of this trope in it. And this one is on audible. I haven't gotten around to reading it personally, though I can confirm that The Black Prism had a couple scenes involving the magic school trope.

Zero Sight by Justin Shier
http://www.amazon.com/Zero-Sight-Series-Book-ebook/dp/B004UB2WME/ref=sr_1_2?s=digital-text&ie=UTF8&qid=1331727297&sr=1-2

e-book only though. I read the first and it's great, only 2 books out for the series and it's like 250 pages

Another great book: Talion Revenant http://www.amazon.com/Talion-Revenant-Michael-Stackpole/dp/0553576569/ref=tmm_pap_title_0?ie=UTF8&qid=1331727432&sr=1-1
about 450 pages