Lots of people already recommended touch typing, I found this very helpful. I was at school in the days before lots of computers (we did have PC's at school but not many) I used a digital typing machine to take notes in class. I have spotted a few different things brought up on this post that I also struggled with.
Being able to remember verbal instructions, I still have to wrigth everything down or I forget things. Taking notes and listening at the same time, I used a tape recorder at university to record lectures this helped. I did a science subject so touch typing wasn't really an option for most of my lectures. But at high school I took notes electronically as it is so much easier for me to do this.
Having extra maths and English lessons helped a lot as mine wasn't picked up until I was 11 and I was already quite far behind with English. Reading for pleasure constantly, I found this helped a lot at school and even now if I don't read then I can tell my ability to read well seems to slip.
I think you can still get these, but having a spell check on the computer which actually lists the meaning of each word and doesn't just give a list of words on there own is really useful. I have an index dictionary as well which makes it far easier to find a word in a dictionary, although I couldn't find one when I wanted to get my nice one.
Coloured backgrounds, I did have glasses for a while but didn't find them that helpful (but if a child wears glasses already I would recommend light reaction glasses and anti reflection coating as glare doesn't help), I still use different colour backgrounds now. Printed books where never as big as a problem than computer screens as most paper backs aren't on white paper.
I read on my phone with the kindle app a lot now and find being able to change font (although that maybe age now 😅) and colour backgrounds very helpful.
I'm also a visual learner and watched a lot of documentaries to help study for GCSE, DD is the same and has watched a lot of YouTube videos. There are some really good ones for both GCSE and A-level's.
As you can probably tell from this post,y grammar and spelling aren't perfect. I'm much better on a computer then on my phone though.