Ace the technical pilot is an excellent book for your interview,covers pretty much everything. You should know your jeppesen charts inside out as they love to grill you on this.
When i went for my interview they asked me a lot of basic aerodynamic questions like explain a stall,and whats a laminar airfoil etc.they can also ask you about Indian climatology so go through meteorology as well.Also study a bit of performance like TORA,ASDA etc.
The pilots who are sitting in the panel are very friendly and make you feel very comfortable so that you dont get nervous,
They can also ask you all about CRM questions so prepare for that as well!
All the best!!
