I got the call from Knight Frank today to inform me that I have been selected for the 2nd interview!

I totally do not know what to expect at all of a 2nd interview. What kind of questions do they ask? How many people will be interviewing me? Will I be interviewing solo or in a group? Do I have to take any tests?

So many questions; I don't know where to start. Anybody can point me in the right direction?