Fair enough, I see where you're coming from and I can see that may well work for some people.
My problem is my air law was taken in April 09, and Met & Human Performance a few months later in July 09. I'm just looking for the dates for the others, but I would have to be retaking 3 or 4 exams minimum to get them all within 18 months of one another if I were to retake Air Law again now.
All gets a little bit complex, I hope that makes sense!