Had the interview on Wednesday...
The tech question exam was pretty straight forward, study the book and you should be fine. There are a few questions at the end that are related to CX fleet, just know what they operate.
If you have any flying experience/licenses (PPL/CPL), just make sure your knowlege is upto that level because in the interview the tech questions will be based around the knowlege you should have for the license.
As for the reasoning test, its either your thing or not... but definately do some practice ones.