I work in a Y1 class in a typical infant school here locally, and can assure you that most of our children are not at the level mrz's school are at in Y1. This applies for reading and writing levels at the very least. IME mthe school mrz achieves way higher than average in these areas - well done to them, but not my experience at all sadly.
Some of the children are capable of writing A4 sides - although by no means even half. Some can write more, but many write farless. We have a few children who are still mark making, unable to form any letters at all.
Reading - ours range from pink (do have a couple of children not really at this level yet even) up to orange or so.
Phonics - varies again. A couple who appear to know all their sounds and are now ready to move on, but equally some who are still learning single letter sounds. The majority are working mid way through phase 3.
Maths - just finished some classroom assessments. Again massive variation here. Sme not recognising all their numbers to 10 yea, a couple who can't count to 10 yet. Many who are still learning number bonds and just starting to do simple add/subtract. A handful who are working really well in numeracy and working on more challenging work.
What are we doing at the moment?
Lots of continous provision (learn through play), outdoor provision and physical stuff.
Daily phonics, weekly reading
Literacy - activities based around our book, wrtiting, phonics work, story telling, 3 part stories, story mountains, finger spaces, letter formation, full stops nd capital letters
Numeracy - number bonds and making 10/20, ordering numbers, writing and reading number sentences/sums, number formation