despondentatwork - personally I don't agree with bringing in notes - but then again I've not really interviewed for government roles apart from contract ones.
What I would say and what I did recently. Go through your CV and job description etc with a fine toothed comb and marry up bits that tie in. Highlight if necessary. Google "interview tips", I did this about 2 weeks ago before my interview and got some really good tips. See if there will be STAR based competency questions and think of answers to those.
I find writing all this down in note form and going through it a lot (you have time before Friday) really helps and bring this in on day of interview - you can refer last minute outside interview to notes.
Also I know it sounds obvious but got interview tips via email yesterday and remember things like - smart suit/work dress and jacket in dark colours - navy/black etc. smart polished shoes. Minimal jewellery and muted makeup, light perfume if any, hair tied back. My SIL always thinks a smart bag makes a good impression - I've got a DKNY black mock croc small bag but bought last minute one day when it broke (got fixed since) a cheaper Accessorize one in greys/blacks - just a small one big enough to fit change of tights etc. Remember if you're wearing sheer tights bring a spare in case of snags. Mints or chewing gum for fresh breath. Put on deodorant in morning. If interview in place you're not familiar with research route. You can also view via linked in people you're being interviewed by and if necessary check website and make notes.
Think of questions to ask them too. Good ones are to ask re typical day or as I did at last one "What type of person do you think will fit in/work best at this role?" gives them a chance to elaborate but you can also tailor your answer to fit in and give examples (show off a bit) your skills. They want to know you're the best fit with their team. Smile, be relaxed and firm handshake. Best behaviour and remember manners, please, thank you and thank you for making time to see me etc. I know all this sounds obvious but honestly I'd forget unless I was primed! Make a bit of small talk but not too much - I asked about offices, how long they'd been there, when they moved, commute time etc but it fills gaps and can earn you 'common ground' points rather than just being the next candidate they're interviewing. Good luck!