Here's the link to Ofqual's guide to the GCSE and A-level exam changes, as they currently stand. (There has been a request to put A-level maths/further maths changes back by another year so they may change again).
www.gov.uk/government/publications/timeline-of-changes-to-gcses-as-and-a-levels/changes-to-gcses-as-and-a-levels-what-will-affect-each-current-school-year-group
I'd be interested to know if anyone can look at that document and not think "what a poorly thought-out mess". The government should be ashamed.