How much weight could i lose over the summer by doing this?

Hi! I'm 13 years old, 5'6 and 143 pounds. If I were to eat healthy the whole summer and keep an 1200 calorie diet daily, run 30 minutes every morning, swim an hour daily, and walk my dog for 1-2 hours, how much weight could i lose in 2 months and 2 weeks. I will also be rollerblading every monday, bike riding every tuesday/thursday, and tennis every saturday. I have a trampoline as well. Thanks so much!