Sorry, I think I'm two months late! I really hope your exams went well - results day for me is tomorrow, is that the same for you?
Thank you for your answer, even though I've already sat the exam, this helped cleared up a lot for me, and it's another fact to submit to my (admittedly larger after a year of Astronomy) database of cool, nerdy Astro stuff.
Hope your tests went well, and good luck with your results!