Failed 2nd time

Right, so i failed again on my 2nd time around. But this time on something completely different. I had a serious on roundabouts, (3 minors well 4 realy). In his views i was going to slow entering roundabouts, but i was doing the same as my lessons and pre-test lessons. I have taken on the chin, rebooked my test and and lesson.
But all this leads me to one question do examiners have a thing eg, they pay more attention to roundabouts, reverse ex, hill starts. Ect ect…

Fyi i not blaming the examiner, it was my fault, even if it was on every roundabout.