Personal Advise: Education Summer Camp or Exemption from Finals?

I'm a 9th grader right now. I'm interested in going to a Duke Summer Camp (featured in London) this summer, but if I go I will miss the first five days of school. If I miss five days of school, I will not be able to be exempt from finals at the end of the year, which counts for 18% of my GPA. My main question is should I go? I might be able to workout a compromise with the school or maybe I could leave early from camp a few days early (although it's extremely expensive), but the camp is something that I REALLY want to do. But this decision could ruin my GPA.