Reception progress so far - advice needed

[BobbyV]

Hi, Im hoping for some guidance/advice/feedback on my sons progress so far in reception.
Hes a March birthday and has had speech and language therapy for the last couple of years which hes progressed well with
He enjoys school and has never said he doesnt want to go which is obviously great, he socialises well and has lots of friends and loves to play
His concentration isnt great but I think 10 minutes is at an expected level for age 5?
Currently hes on level 2pink books which is at the start of the reading scale and hes attempting red books but struggling.
He can count up to 20 but not backwards (misses a few) can count in 10s if I prompt him
His teacher has supplied a copy of his development matters report for spring and the majority are 40-60 emerging (4 areas are 40-60 developing)
Is this something I should be worried about?
Can anyone give me some guidance on the assessment thats done at the end of reception year for early learning goals as Im pretty clueless I have to say

Well from what I can make out only 40% of children achieved at expected level in all areas by the end of reception.
The goal posts have been moved: they are now expected to read and decode simple sentences (usually reading around a level 3-4 which is yellow or green) and write simple sentences using punctuation.
It seems a lot.

They need to be adding and taking away with numbers to 20 and there are also numeracy goals to do with shape and measure, data handling etc.

My ds is five in six weeks. He is reading yellow/green books and is on phase 4 of letters and sounds. His writing isn't great - mainly the formation as much as anything. He has good comprehension of stories and has good ideas for writing so I'm hoping the rest will come. We have recently discovered his eyesight is very poor and he's just had glasses so that might help too.

His maths is stronger I would say, he can add and subtract with numbers to 20, find one more and one less with numbers to 100 and also 10 more and 10 less. He counts to 100 (well sings really thanks to the numbers song on YouTube), counts in 2s and 10s and can double although I don't know if he can halve. Is good with shape and measure.
I'm expecting him to be averageish overall.

I would say that at this age they can plod along for a while and then suddenly, almost overnight, make a massive jump. It's my opinion also that we expect too much too soon with our children. Why does a 4 or 5 year old need to be using full stops and capitals? Really?