I’m in my teens and I have a small amount of unwanted flab which I want to get rid of before summer. What sort of exercises would you say work fastest and most effectively towards weight loss?

I know it is not the most healthy way to lose weight whatsoever.. but I am 19, 193 pounds, and very uncomfortable with my body. I have tried diet and exercise and even cut out soda for 5 months almost completely and drank water and green tea…I’ve still only lost about 20 lbs ( used to be 210). I want to be 160 or lower before summertime, and this is the only way I could do it. Which weight loss pill system would you recommendd, and how many pounds did you lose in a 3 month period?