MaryMarigold:
I've been there and I absolutely understand that it can be a bit upsetting to see your child struggling with something whilst others around him/ her are doing it with ease. It is understandably worrying.
I agree with IndigoBell insofar as it doesn't hurt to understand what your child should be able to do - and for many parents it can mean comparing with other kids the know (often school friends).
If you are concerned. Try speaking with the teacher and seeing if she can tell you where your DS is struggling and see if she has suggestions on how you can help at home.
If no joy there (and that was our situation). Then focus on the essentials: reading, writing and mathematics.
Reading - be sure to regularly read with your DS and try and encourage as much sounding out and attempts at sounding out (successful or unsuccessful as possible). As reading improves you can start to talk about the story more (what do you think will happen next?, Did the author use any words to help make the story spooky?, Which character did you like? Which character did you dislike? and so on).
Writing: If handwriting is letting your son down. Try and get in some practice. Send post cards to friends/ relatives when on vacation. Encourage him to write captions to pictures. Encourage him to write thank you cards/ birthday cards. Encourage Christmas cards/ other holiday cards. Encourage writing to enter competitions (tons on children's tv & magazines; also some book series). There's also a brilliant webpage that can help prepare practice writing: www.handwritingworksheets.com/. We started using the cursive writing sheets for spelling words in Y2 - very helpful.
Maths: If this isn't your thing and you're struggling with ideas. For free try: BBC Bitesize KS1. If you feel that he's not getting the concepts and needs teaching support many recommend www.wizz.com. We use mathsfactor (but I have DDs and am not sure if this will suit boys) info here: themathsfactor.com/.
If you want to find out more about what your DC should be doing in a given school year: I recommend Campaign for Read Education's curriculum statements : www.cre.org.uk/primary_contents.html - this is 'ideal world' stuff but does give you an idea of what the 'gold standard' of education would be for Y1, Y2, etc...
I highly recommend spending some time exploring materials on the BBC Learning [BETA] website. You can be sneaky and go through schools/ teachers and get right to all sorts of wonderful resources. Info here: www.bbc.co.uk/schools/teachers/ - Just select KS1 or KS2 in the orange box (midway down on left side of webpage) and then select appropriate topic.
My DD1 (now Y4) was really really struggling toward the end of Y2 in reading, writing and maths. We were desperately worried - so we started a routine. We regularly put in 30 minutes a day (which is more than she watches tv or plays video games) on reading, writing or maths (we try to vary it) and just slowly an steadily tried to work through things to improve her grasp of concepts and give her the practice she clearly needed. It may not suit everybody -but it has made a huge difference for our DD.
Hope that helps.