Alex de Campi 
Kat and Mouse #1 [EPUB ebook] 

When Kat’s dad gets a job as a science teacher at a posh private school, things seem perfect — that is, until Kat’s rich, popular classmates shove her to the bottom of the social heap just for being smart. And bad turns to worse when an anonymous student blackmails Kat’s dad to give the class better grades! Can Kat and her new friend, the rebellious computer nerd Mouse, find the real culprits before Kat’s dad loses his job?