This is what I'm worried about with my DCs in their (state) school.
My DD is very bright and has been from a young age. She has the most amazing memory. She was exceeding in reading for the first three years, but has now gone down to expected and has made little progress this year. They're not really bothered as to find out why, though I suspect she relies too much on sight reading and not using phonics, as her spellings are the same (she remembers them visually and can remember really hard ones if she memorises them, but makes silly mistakes like 'geat' for 'great'.)
Her handwriting is also pretty bad and she has an odd pencil grip (but again, noone picked up on this, I suggested she use a rubber pencil grip not knowing if this was the right thing to do, it has seemed to help slightly and they're fine for her to use it, but it was down to me to realise).
She's definitely not reaching her potential, but because she's reaching expected levels, they don't really care.
She does likely have some ND issues which she is on the pathway for, but again, this took a lot of pushing from me; again because she's mostly 'fine' in school (aside from meltdowns going in and a few idiosyncrasies), they don't really care - they're too busy dealing with all the kids who are acting out in school.
Unfortunately we can't afford private school, but I am going to look into an educational psychologist assessment and tutoring.
And my younger DS, bless him. Likely no ND, but he is quite quiet and sensitive and in a quite ND-heavy class (including a child still in nappies, one who throws chairs due to family trauma, a few others with ASD), he just gets a bit lost.