Regarding the bottleneck activity – if you divide the number of salon working hours for, say, one week, on a time spent by every specialist on a client, you can see, that the number of clients senior stylists can serve is much less than other specialists do.
I think it was hard in a sense of time. You can actually get enough points by completing the big cases if you are good at those topics. But MCQs – each gives you only 2 marks, but most of them require calculations – very time consuming in total.