Be More Chill — Ned Vizzini

Jeremy Heere is your average high school dork. Day after day, he stares at beautiful Christine, the girl he can never have, and dryly notes the small humiliations that come his way. . . until the day he finds out about the "squip." This pill-sized supercomputer, when swallowed, is guaranteed to bring you whatever you most desire in life. By instructing him on everything from what to wear to how to talk and walk, the squip transforms Jeremy from Supergeek into one of the most popular guys in class. Soon he is friends with his former tormentors and has the attention of the hottest girls in school. But Jeremy eventually discovers that there is also a dark side to having a computer inside your brain-and it can have disastrous consequences.