ds moved back at that stage and was way off the average. tbh it took a good few years for him to find his niche. The difference is so much more marked now that dd has reached that age. Last year (she's just started year 4 and turned 8 in August)she could, for example :- Write a short story, poem and paragraphs of description unprompted, using full stops, capital letters and punctuation like commas, question marks, exclamation marks although some of the others were still using more basic punctuation. Answer comprehension questions from a text. Read chapter books (although there is still huge variation within her year group between free readers and those on reading scheme type books). Maths into hundreds and thousands, times tables and division, understanding graphs, symmetry. Plus lots of topic work in history, science, geography etc.
Ideally look for information about Key stage 1 on the Standards site as that breaks it down very specifically. We were told as long as ds could read well and had concepts of numbers etc he would be ok and eventually he has.
difficult to say. He was at an International school for 4 years previously where the various teachers had no common concept of what a child should achieve at what stage and how they should be taught so he wasn't given a systematic grounding in the basics (ie spelling) which made it hard to adapt. We tried to supplement at home but it was hard and he was too readily distracted. frotunatley we ahd access to materials in English and a friend had been a primary teacher in UK so was able to give me a steer.