G'day mate ,
Firstly congrats for the second interview.When r u r getting to HK.I will be there on the 09th.
I am in the simialr situation as you.I really dont know much about the math test .It would be great to find out from guys who have previously been through the interview and can shed some lights on the actual math test for CX and sorta guide us as to what we can prepare for ??