my online mocks start on the 25th. they'll either be on exam.net or teams. the school claims these exams won't be graded and they won't affect our final grades, they're "just to see what teachers need to focus on", but that's just bs.
update: i finished school on the 21st of may, we ended up doing a bunch of exams all throughout the last month which will be assessed and used to determine our final grades. i think everyone felt a lot more secure knowing that our performance will be taken into account and not just UCAS predictions - still, the gov scrapping grade boundaries is definitely causing some uncertainty.