My grandson in year 10 missed 6 weeks schooling in the autumn term not including scheduled half term and Christmas holidays.
In October two kids in his year tested positive so the whole year was sent home to self isolate. When the two weeks were up it was half term holiday but the return to school was extended by a further week, making 3 weeks missed.
In December a kid in his year, who takes the same school bus, tested positive so the entire year plus anyone else on the school bus was sent home to self isolate for two weeks. At the end of the two weeks the school finished a week early for the Christmas holidays, making another 3 weeks missed.
Now he'll miss a 7th week in January because the school will remain closed for another week's extended holiday.
In the meantime he's been set work by his teachers who encouraged the kids to email them if they get stuck. When he did get stuck he emailed the teacher for clarification and didn't get a reply.
amp.theguardian.com