I'm a 19 year old female and weigh 305 pounds. Would it be healthy to eat 1200-1500 calories a day and exercise 30-60 min to lose weight?

Weight loss. Dr. Dimitri Novitzky commented: I did a calculation, for your weight. 305 Lb, and a height of 68 in, your BMI is=45,6. First have an endocrinological workup, see a weight loss program, Do daily exercises for 60 min, have a trainer and explain why. If no results, See a bariatric surgeon who performs gastric banding, which defenitively will help big time, the procedure is endoscopic, very easy on you.
Yes,but. Visit your doc & see how vigorous your workouts can get & whether their are any types of activity you should avoid.