Descend by G. Bailey

Welcome to Angel Academy. The only way to be accepted is to die.
My name is Kaitlyn Lightson, and I can see ghosts.
Despite my weird ability, that no one but my best friend knows about, my life is pretty normal. In a few months, I will be at university and far away from my small ghost town I’ve lived my whole life in.
But one deadly car accident changed everything.
Death was not the end for me, because instead, I became an angel. Guardian Angel to be exact and my only job is to protect important humans in dire need to pay back the debt of our second life.
Only if I can survive Angel Academy that is.
Turns out Angel Academy is deadlier than any school I’ve been to before…
I have to choose a side, light or dark, at the end of my first year.
Light angels are good, kind and the choice my best friend is sure to take.
Dark angels are evil, seductive and they call me to me more than I want to admit.
Seduction is a game in this world, and dark angels know how to play it better than most.
And I want to play.