Gimme a call (Really freaky)

This book is really confusing at first because there are two people talking at the book and I really don't understand it. First there is the character name Devi who is he senior highschooler and then there is a freshman Devi. It's so freaky because she made a wish that she could fix her past freshman year and all of a sudden her phone droppped out of her hands into a magical fountain to talk to her freshman person. But as I kept reading the book, I started liking the book because she fell in love with this guy name Brian and he broke her heart and left to another college, so now she doesn't have anyone to go to the senior prom. And that's kind of the reason why she wanted to change her freshman year, she did a lot of bad things though like how her friend got a diet because she became a cheerleader (I like the way I am but if I were a cheerleader, a diet is a big problemo for me.)