Please give me some solution as it's urgent?

your story makes me sad, i cant beleive your teacher can get away with that in India. you said you've had medical problems, but didnt say your weight gain is health related. maybe you eat too much for comfort. so you have to start eating healthy foods (no fried foods or breads, cut back on the rice) and walking for a least thirty minutes a day to burn off the calories. start easy with the lifestly changes and by the time you are 20, you will be a hot stud! Good Luck, sweetie!