Just thought of something if it helps at all!
I had ME as a teenager and missed an entire YEAR of school between the ages of 13 and 14. I had some work sent home yes but I was very unwell and did very little.
When I returned I was behind, especially in STEM subjects, but I got As in my Highers in fifth year (age 17) and As and Bs in Advanced Highers in sixth year. I caught up! And that was with very little / to no work at home.
Makes me feel a bit better when my ten year old is refusing to work anyway :) hope it helps some people panicking!