@bluefineliner thank you, I might ask him him to speak with is lovely Chemistry teacher as it's his form teacher that has given the feedback.
@Ventress yes, had lots of looks and, personally, I don't think his draft was that dissimilar in style to those claiming to be successful Oxbridge / Durham etc type ones. Obviously you need to be carefully not to be cribbing other peoples PSs but content wise it feels similar. Apparently yes, you have to show your passion for the subject to make yourself stand out. He's not applying to Oxbridge or big London unis now, but has Bath, Notts and Sheffield on his list and his predicted grades are good for those. No other apprenticeships have come on our radar, Chemistry ones aren't really a thing it would seem, unless you specifically want to be a lab technician which he doesn't.
Well done to your DS on his offer, I agree it's easy for them to get obsessed, we have seen friends do the same and DS's girlfriend has applied to Oxford and is similar.
I'm so sorry to hear about your diagnosis that must be so hard for you to be dealing with. Do not beat yourself up over the timings of this, you must put your health first and I am sure your DS absolutely understands this. I hope the chemo is doing it's job and you don't have to suffer it for too much longer. 