Welcome Matmum,
thanks for introducing me to your family! Your children sound lovely. I'm sorry to hear about your DD's medical issues.
I'm glad to hear that your DS figured out how to get the subject accelerations he needed without having to give up sports with agemates! Go DS! Being serious about sports or scholarships are very good reasons to leave the base grade alone.
Good luck waiting out the test results. I'm wondering that if DD doesn't do as well on her Certificate results as you expect, are there folks who do IQ testing and give advice to make sure her results are a good overall reflection of her abilities/potential? In the US the transition into and out of college are key times for getting paid advice and IQ/achievement testing is often part of that.
Anyway, keep us posted and a great big welcome to you!
Love and More Love,
Grinity