Don't eat junk food or drink sodas and exercise.
Losing 10 pounds in a month means losing 2.5 pounds per week. That translates to a calorie deficit of 1250 kcal per day.
Assuming your BMR is 1800 kcal. Your daily intake allowance would be 550 kcal. A safe diet would be eating at least 1200 kcal. That means you should do 650 kcal of exercise.
Exercising that much would be tough though.