Do not restrict yourself to 1200 calories. It is very unhealthy and your body will become nutrient deficient. If you are trying to lose weight the best thing to do is change your lifestyle-- not go on a diet. Go one a diet and you'll gain the weight back if not more. Change your lifestyle and you will lose your desired weight if not more and keep it off.
If you want to lose 20 pounds in 2 months I thoroughly recommend choosing a vegan lifestyle(you wouldn't have to restrict/count calories or exercise as much) but if that is jut not in the books...
Eat healthy. Tons of fruits and veggies. Whole grains. Legumes. Beans. HEALTHY fats. Like avocados and nuts. Drink at least 2 liters of water every day. Recommended that you drink 16 ounces instantly after waking up. Then proceed with breakfast.
I recommend you eat 4 small meals through out the day. About every 4 hours.
If you want some recipes or more info you an message me. I'd be happy to share
Try Gorilla Workout as well and run
I suggest you cut your calories to at least 1200 and eat plenty of fruits and vegetables. Another is to exercise at least an hour a day. I'm not sure if you will lose 20 pounds in two months but you will definitely see results.