It really depends on how much "homework" one has done to understand the school. As I said a long time ago, lazy parents seldom get rewards. Seeking and using shortcuts is almost a norm nowadays, but is it the way to educate our child or an example for our child to follow?
I'd rather conceal or use a more diplomatic answer than tell a lie. It may sound silly in today's society but it is my principle not to lie.
I don't think we should generelise that "有d係臨急先黎抱佛腳, 乜都無準備. 所以面試班就應運而生". My son attended an interview class and I wanted him to learn skills and manners in interviews, not memorise standard, impressive answers.