I did my interview back in December I believe (or maybe January). For the pharmaceutical calculations, they give you 10 minutes to answer 2 questions. It's without a calculator, so make sure you are able to multiply and divide without one. I can't exactly remember the questions I'm afraid.
The situational judgement part is when you sit in a small room with a lecturer, they give you a scenario and you tell them what you would do, and explain why.
I found it a bit stressing as it was my first interview, but they were all very nice (not scary).