How Do I Lose Weight Fast?

Okay, so the new school year is coming up and i want to be sure i look my best. However, losing weight is priority for me because i am a little over weight. I am a 15 year old girl that weighs 163 and is 5'4 in height. So i want to know if you guys know of any diets/regimens that will help me lose about 20 pounds in the next month or so. But i don't want those diets that nearly starve you to get fast results. Can you guys help me please?