Interview tips for HMPPS

I've got an interview coming up for an administrator role with HMPPS. working in the prison and probation service has always been a goal of mine and something I'm passionate about.

However it's my first real interview. Ive just left uni and all other jobs have been very informal (animal sitting/baby sitting etc) Does anyone have any tips? I'd really love this job and will be quite gutted if I don't get it

Thank you!!