I want to know how is the interview for regular recruitment different from CSS interviews.

I have interview for the position of Lecturer (Human Resources) in FPSC.
Would appreciate any tips and advises regarding it from all specifically if anyone here has already appeared in such interviews.

I am specially curious about will it be subject based, will i have to give demo. And all the related stuff.

Thanks in advance
P.S it's my first post/thread here.