ono - hope you get the results of your DS' blood tests soon. I assume he's being tested for glandular fever is he? We also know a boy who's been diagnosed with an underactive thyroid who was constantly ill/tired etc before being diagnosed.
Yes, DS1 has 10 AS exams coming up. He's doing 4 unreformed A-levels (hence 10 AS exams) including General Studies, which his school gives them no choice over. He's also doing one reformed subject, but the school has not put them in for AS exams for that subject, so he'll just do end-of-year exams in that one. However, it's still important because the school will use those results to predict A-level grades on university applications.
In fact, looking at DS's exam timetable I've just noticed there are two additional entries which say "Not timetabled" so have sent DS off to check what on earth that means. Hopefully there aren't yet more exams to be slotted in....