I was assuming that an EASA Medical would be the next step after passing the Group Interview stage?
I'd look into booking your medical as soon as possible, even before doing the assessments. I booked mine 3 weeks ago, and the first appointment was the 8th November. There are only 2 places in the UK right now for initial medicals, so demand is high. The place I booked allows me to cancel without any payment required if I decide i don't want it/am unsuccessful with easyJet.
Sat the maths/aptitude tests yesterday, and there were 4 girls there out of about 45 in the first 3 sessions of the day.