Tips to lose the weight faster?

Ive been on a diet for 2 weeks so far and ive lost so much weight. From 156lb to 137lb ! and im happy about that. But i have exactly 3 more weeks to lose 15-20 pounds, do you have tips? I am already doing 30 min cardio every day, eating healthy, and drinking lots of water. i just need some more natural tips to speed up the weight loss for school??
i am sixteen and small boned.
and 5.5ft

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