I personally don’t see an issue moving kids back a year. We start our kids at school way to young compared to the rest of the world. Move them all back a year and don’t accept an intake this year.
I have a 3 year old, due to start school nursery. I would hate the thought that they would miss out on early education. I know it's not compulsory for them yet ,but they need interaction with other kids their age , and I don't know how to teach them things the way a teacher would .
I have a gcse aged child too, and they have already learned all the background and are able further their learning, if need be and expand on skills they already have . When they get a job , they will acquire skills and knowledge specific to their employment. I'm not as worried about them as I am the little one . I feel like little ones education is being disregarded for the sake of exam results.
Skills test wise, I've had to do one before as well. My first week of my masters, we were told to complete one to see where "everyone was at!" and they said the same thing - bc we had done our GCSE's a while ago, they wanted to see what knowledge was maintained, what needed to be worked on etc.
I'm going off topic but the key skills I was referring too are an equivalent qualification to gcses in English, maths (and possibly I.t) at c or above( for people who didn't achieve these in their gcse exams).
I was surprised i needed these since I exceeded theses grades at gcse.