Open Question: How do I drop my weight by 7 kg as fast as possible? WILL TRY ANY METHOD?

I am 16 years old, and weigh 62 kg. According to my BMI, I am of average weight, but I am not happy with my appearance. I used a nutritional calculator on about.com, which stated that if I ingest 1540 calories a day, I'll lose 0.5 kg per week. Summer holiday is coming up...I will be EXTREMELY busy during july, so I have exactly 6 weeks to lose 7 kg. However, I would LOVE it if I could lose it