Please find the name of the movie

The movie is about a poor ugly smart girl with pimples in her face who is bullied by a fat rich girl there was a scene where the fat girl gave the poor girl something to eat which made the poor girl fart and have to use the toilet ,there is also a scene where the fat girl parents bribe and pay extra money so that their daughter will score a high mark and the fat girl tries to use the poor girls crush to distract her so that she can get higher grades than her but they ended up having the same grade and they later grow up and the poor girl does surgery and removes the acne on her face and becomes a beautiful teacher while the fat girl does surgery and becomes slim