The Awakening (Zodiac Academy, #1) by Caroline Peckham & Susanne Valenti

You have been selected to attend Zodiac Academy, where your star sign defines your destiny. If you're one of the Fae, elemental magic is in your blood. And apparently it's in ours. As twins born in the month of Gemini, we're a rare breed even in this academy of supernatural a-holes. Changelings were outlawed hundreds of years ago but I guess our birth parents didn't get the memo. Which means we're totally unprepared for the ruthless world of Fae. Air. Fire. Water. Earth. No one has ever harnessed all four of them, until we arrived. And it hasn't made us any friends so far. As the rarest Elementals ever known, we're already a threat to the four celestial heirs; the popular, vindictive bullies who happen to be some of the hottest guys we've ever seen. It doesn't help that they're the most dangerous beasts in the Academy. And probably on earth too. Our fates are intertwined, but they want us gone. They've only got until the lunar eclipse to force us out and they'll stop at nothing to succeed. We never knew we had a birthright to live up to but now that we do, we intend to claim our throne. We can't expect any help from the faculty when it comes to defending ourselves. So if the dragon shifters want some target practice, the werewolves want someone to hunt or the vampires fancy a snack then we have to be ready. But we've been looking after each other for a long time and fighting back is in our blood. Today's horoscope: totally screwed.