Different sources of stress can do different things though, I always ran low doing exams, though for things like job interviews I'd run high. Even nowadays the stress of going shopping will make me run low while the stress of setting out on a long and never-ridden ride will force it high. So, it depends. With all that said I'm sure he'll be fine, I managed to get through without any problems back in the days of one injection a day and finger prick only tests - lots of chocolate bars with wrappers that don't make noise when being unwrapped (which is quite important as exams are very quiet!)You’ll see that your son will have adjustments made for him. As regards stress, it tends to push blood sugar up, but can also, occasionally push it low. Does your son have a Libre or other CGM? What insulins does he take? Did he lose weight before diagnosis? If so, he might be feeling quite weak and need a little time to get back to full strength as his body recovers now it has the insulin it needs.
I think there is the big difference here and one you are not taking into consideration. This diagnosis is happening right before the exams. You had 8 years to get your head around it before you got to this stage. It takes months to get into the swing of managing diabetes with insulin, plus the diagnosis has come during teenage years which are physically and emotionally challenging in themselves without getting this dumped in your lap right before your main exams. It is a lot to take on board as well as swatting for exams and the sheer pressure of those exams.I was diagnosed at 7, I've sat GCSEs, A-Levels, Uni exams. Same approach for them all. It's a minor inconvenience, I don't think it should get in the way and cause major problems.
There’s some general exam information here too:
Exams and diabetes management at school
Under equality laws across the UK, every school has to make reasonable adjustments to help any child who might have a disability, which includes type 1 diabetes, from not getting the grades they deserve because of it. Although parents and children might not consider diabetes as a disability...www.diabetes.org.uk