Twin Switch (Sweet Valley Jr. High(TM))
By Francine Pascal.
Description
Jessica thinks the cool thing about having a twin is that you can always count on her to help you out. Especially when your twin is superperfect, ultrasweet, never-gets-mad Elizabeth.But...Elizabeth doesn't understand why Jessica can't solve her own problems for once. Really, if she didn't love her sister, she might have to strangle her! - from Amzon
ISBN(s)
0553486683, 9780553486681