His Smarty Pants by Mayra Statham

Smarty pants Cora Meadows and soccer goalie Milo Clark hit it off the first time they met. Major sparks flew with a first kiss, but reality had them crash and burn their freshman year. Fast forward the start of their senior year at University of the Desert.
He’s in trouble, and she is his only hope. When he asks for help, she finds herself striking up the deal of a lifetime. An exchange. She will help him pass Greek Mythology as long as he will pretend to be her boyfriend, so her match-making sorority sisters will leave her alone. Shouldn’t be a problem, right?
Wrong!
All too quickly they start to realize the fireworks from their first kiss years ago were far from a fluke. The high-voltage chemistry they share now is undeniable. Can Miss Smarty Pants and the Jock have a future? Or is it a matter of time before they fizzle out?