How much do you think I'll lose?

Okay I am approx 141 give or take 2 pounds. Anyway, so i joined bally fitness. On Fridays, Saturdays, and Sundays, I am gonna go there and work out for about 2 hours everyday. On Wednesdays and Mondays I workout at home, and sometimes on Tuesdays as well. Thursday is my rest day. I keep a diet of eating about 1100 to 1200 calories per day I am 5'7 or 5'8 and 16 years old. I wanna lose 12 pounds in 5 and a half weeks . What else should I do, and with this diet how much do you think I'll lose? ( The workouts are pretty intense.)