If the students weigh one hundred and fifty kilograms, they are a little overweight, so they should step up their weight loss. However, 15 years old is just the age to grow physically, so it is normal to gain weight at this age, but it should be prevented as early as possible, because once they gain weight, it will not be easy to lose weight. It is best not to go on a diet, because the long physical stage needs nutrition. Usually, we should eat more foods containing protein and eat less fried puffed food and sweet chocolate. Eating is the fattest thing, but dark chocolate is the best way to lose weight. Then do more exercise, such as aerobic exercise, which is very effective, but keep jogging for half an hour every day, so as to lose weight and exercise. Losing weight is the best way to lose weight, but remember to exercise moderately. I hope you can lose weight successfully.