So I passed my class 2 a month ago and applied for a place and they rang me today as they’re looking for someone to start immediately and asked me to come in for an interview tomorrow (obviously I accepted).
I’m still young and have very little experience in interviews. Would should I expect to be asked in an hgv job interview?
Congrats on your pass and interview pal! 
I’d expect them to ask you questions to see what you remember from your training mate, and whether you have a grasp of the Drivers Hours and Working Time Directive (WTD). But it’s not going to be a test trying to trip you up or catch you out, they will be trying to find out what you know, where you are strong and weak, and what sort of person you are. Obviously they will expect you to have a grip on the basics, but they won’t expect you to know everything…
What they will probably be more interested in is discussed in this thread: viewtopic.php?f=5&t=141752&p=2232708#p2232708
Best of luck pal!