Lockdown has massively affected children’s learning. I teach Y3/4 and barely any of them are where they would have been in an emotional/social sense, and very few of them academically. Number sense, handwriting and spellings seem to be the areas most affected by lockdown, across the entire country.
Whoever has told you that ADHD will not affect your child’s academic progress is wrong. ADHD affects all areas of learning and without additional support can mean that your child does not achieve their potential. My youngest (now Y5) has ADHD and I fought for this diagnosis for many years, since he was in reception, with his old school but they weren’t interested in the slightest, just labelled him as naughty. He was achieving expected or greater depth in all areas so as far as they were concerned, everything was fine. I moved him to a different school in September and within three weeks they wanted to refer him for an ADHD diagnosis (without me having said anything to them) and had all sorts of plans put in place to help him emotionally and academically.
ADHD affects concentration, working memory, self-regulation, organisation and processing, amongst other things. I can’t believe someone told you it had no effect!! I have chn with ADHD in my own class and one of the things I have in place is silent signals for them to give me, so they can go and have a wiggle, or a reset, so that when they are working, they have more chance of being settled enough to learn.
If you think that your child’s ADHD is affecting their learning (has this been diagnosed formally?), go in and speak to the class teacher and ask them to put together an IEP that details how they will support your child in class.
In terms of them being behind, ask the teacher to give you the specific areas that they are behind in so that you can find some activities for them to work on at home. If it is number bonds to 10, for example, there are loads of free games on Topmarks website to work on these (and loads of other fab maths games). If it is spelling, there are free and paid for apps (such as Spelling Shed) that can help with this - or you can make your own games. If your children are struggling with reading using phonics, try making them some flash cards and having them do some sight reading instead. The Ladybird ‘Peter and Jane’ books are sight-reading/high frequency words based, rather than phonically decodeable, and are what my eldest child used. She never really took to phonics.