[ Diet & Fitness ] Open Question : How to lose 20-25 pounds before September 13!!!?

HELP!!!! I'm starting high school this year and really want to look different!!!! I totally let the summer slip by!!! I'm 5'5" and 180 pounds. I really don't look 180 but..... My mom wont let me go on a crash diet so.... Idk wat to do????? Help!!!!!