What_goes_up in the intervtew be yourself, don't try and impress we're not looking for rocket scientists, we're looking for guys and gals who can get along with others and have a professional attitude.
NOTECHS is a BA invetion and it is designed to evaluate and assist your "non Technical" skills in other words the instructor is not only looking at how you flew the single engine approach but how you interacted with the other crew member. In a few words its applied crm in the flightdeck. The concept of NOTECHS is to train instructors and examiners not only to intsruct and evaluate technical skills but also non technical which nowadays lead to many aircraft accidents. By filming the sim session you will see many things which you probably don't even remember you did or said, things which you will realize that although seemed at the time a given to you led to confussion for example. Very interesting stuff, I'm sure you'll be impressed and learn a lot.
I would advise reading up on your A320 limitations and memory items.
Best of luck to you
Regards
Snails