www.walesonline.co.uk/news/education/coronavirus-gcse-alevel-schools-exams-17994497
For GCSE it seems if they were due to finish GCSE this year they'll be treated like Y11s.
If there were due to sit first exams - they will either sit them next summer or they won't be examined and grade will rest on other exams due to be sat next summer. I don't know how much input the kids will have and how much the school will decide for them.
Y12
This year’s AS students will still receive an AS grade. However, it will be calculated using a range of evidence, including teacher assessed grades.
In summer 2021, current AS learners will have two options for their A-level award. They can choose whether to:
Only sit the A2 units, with the A-level grade based on their performance in the A2 units.
or
Sit both the AS and A2 units. They will be awarded the best grade from either route.