Dan Rafter 
Gearz #2 [EPUB ebook] 

Karen Chugg is suddenly the most popular student in school. But she can’t shake the sneaking suspicion that her newfound popularity has more to do with her three new friends – each of whom happens to be a super-powered robot – than it does with her gluten-free cookies, big heart and winning smile. Then there’s the matter of the rogue teachers, chemical-fueled beasts, hooded assassins and clueless president, all of whom would like to tear Karen’s new robot pals apart. And if that’s not enough for a high school junior to worry about, there’s also the new boy in school, who just happens to be the only robot bigger, meaner and deadlier than Karen’s new friends.