Strategies To Lose Weight Fast

I am going to try and lost weight. I weigh 180 pounds and I’m only 13. I am so sick of being called the “fat kid”. It really hurts my feelings. I want to lose enough weight to be thin by the beginning of the new school year (beginning of September). If I eat approximately 1,200 calories a day, how many calories will I lose by doing 120 minutes of intense cardio a day? Tell me the amount of weight loss in a week. Thanks!