Hi
You are right, an interview is always a gamble. They can ask anything and you should need to have luck that they'll ask the good question. It is simply virtually impossible to review everything.
What i always reviewed:
read the book "ace, the technical pilot interview". Ok some questions are not that well explained.
Study performance, especially performance A aircraft. Skip all the rest.
Study meteo
Study aerodynamics
Study doc 8168
It always worked for me.
Dumbs up
