For those who believe in invented Gods apparently the exam boards may make some changes. I think the having key exams first in the mornings is the best proposal. One of my children last year who did pretty well in GCSEs often doesn't have any breakfast so he has an kind of Radaman fast anyway from 10pm to lunch or even after school sometimes. I think we can work around this.
It is not for 30 years that Ramadan has fallen so fully within the GCSE and A level period and then we had many fewer people prepared to believe in such things.