My identical twin sister and I are total opposites. Meaning, I’m way popular and she’s so not. How is this possible? I’m friendly, flirty, and don’t spend every second buried in a textbook. She’s Miss Mathematics (and Miss Headband–hello?–of Hughley High). But here’s what’s really weird: I’m sweating Mr. Mathematics (he’s new). So if I could just borrow her identity and headband for a few days. . . .