I picked this up for 3 reasons: I really need to practice my reading; The premise sounded interesting enough; There'll be a movie (release date: 2015, May 1st).
The story is told quickly. Sayaka is a 17-year-old Gyaru with bleached hair, short skirts and lots of make-up. Her 学力偏差値 (average score at standardized school tests) is 30 (out of 100), she's worst in her class. To make her mother happy she starts visiting a cram school and notices herself that her level is so low (her English is on elementary 4 level) something has to be done. Over the course of the next year and a half her level improves so far she gets into Keio University, the oldest school for higher education in the country.
So far, so obvious, the ending is in the title.
However, the story of Sayaka's circumstances, her family and the change occuring in her, is nothing short of extraordinary. You really get a feeling for how her special personality, the support of especially her mother and her cram school teacher, and her astonishingly hard work have made this possible. In a letter to the reader, Sayaka urges us to not think that she was special to begin with - everyone can do what she's done. It's really one of these books that make you want to get off your arse and get things done. :)