If dc take gcse super early how does this affect them in year 11

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i was reading about a family who had their dc sit their gcse maths at primary school age and get top grades, how does this affect them when they get older and would normally be sitting maths with their other gcse subjects.
Also, would it affect university applications?!

I guess the school need to make some kind of alternative provision for the child in the subject they excel in. A bit of a pain for the school as these early papers tend to be taken at primary age and the secondary have had no choice but to scramble about to put something special in place for one kid.

GCSEs probably won’t affect uni applications too much so long as they have the grades but if the kid decides to do an a-level in maths at about 13 then there’s a potential question about what do they want to do at uni and when. There are a handful of cases where a teenager has got to study at Cambridge but these are rare. Most of the time the minimum age is 17 and most of the time universities ask for 3 a levels taken in one sitting. Perhaps it’s different for someone who is truly exceptional.

A single gcse early then continuing with the a level will not affect university admissions but they do take a dim view of parents (usually home school) who sit their children for GCSEs piecemeal over several years because part of the skill of GCSEs is taking 8-10 at once, studying for just one isn't that difficult for a typical 13/14 year old, especially if they then stop studying that subject. The information we had was that only GCSEs taken over a 2 calendar year period would count except in exceptional circumstances, eg you can take a year early or late

Home Ed children are judged by different rules wrt piecemeal GCSEs, partly because the parents have to pay for the exams.

Zero point taking a maths GCSE years early unless you are going to get a 9 and have agreed a plan of action for following years. Much better to stretch into areas of maths not on GCSE syllabus, of which there are plenty.