The Ace of Westlake High by Nicole S. Goodin

Eighteen years built on a web of lies… and with one whispered secret, it unravels before my eyes.
I’ve always known that one day the truth would come out, but I never expected it to send me spiralling down a path of self-destruction and bad decisions.
When my screw ups finally start to catch up with me, I’m thrown straight out of my world, and dropped directly into hers.
Lily Wilder.
She’s probably the biggest nerd in the whole school, and she’s easily the smartest person I’ve ever met. She’s sweet, sassy and far too good for me.
She thinks I’m just a dumb rugby player whose old habits die hard. She might be right.
I think she could be exactly what I need to turn my life around. Maybe I’ll find out.
Lies. Destruction. Deception. If I’m going to have any chance at getting the girl, I’ll have to figure out a way to convince her that she’s not too smart to waste her time with a guy like me.