Thanks! Yeah the ac consists of applicants to different roles/schemes and to different locations too (even if they're applying to the same scheme as you). Its far better that way imo, because you're not competing against them. Everyone's working together, and hopefully out to help one another.
My tips/strategy for interviews in general, is to create a word document listing out all your experiences which you believe to be good talking points and examples (could be work-related, volunteering, school/uni) and write bullet points for each detailing what you did and achieved through them, and then imagine what skills could be assigned to each one, so that you know what experience to refer back to if these skills/strengths are asked about in an interview. Regularly read and try to memorise the document as much as possible. When writing out the word document, try to include a wide variety of examples based on skills, e.g people-based skills to analytical and technical. My other personal tips for the interview are to be vocal, sound enthusiastic and happy when speaking to look engaged, make hand gestures etc. Also each time when I answer a question, at the end I would circle back and summarise what I said very quickly, so that I'm sending out the main message. You dont always have to do that tbh but i find it to be helpful, personally.
Presentation is very nice and relaxed, was quite short and I really enjoyed it. And questions aren't difficult, so dont worry about that. For the case study, make sure you keep track of time - you dont have too long. Be sure to scan the info quickly and most importantly, include all the bits you're asked to include. Make a mental note of when your time is up and refer back to the time every now and then. The case study itself is very straightforward. You just need to be good at managing time and be sure to answer every aspect of the question, even if some parts are short (which i was guilty of too!).
My other tips in general would be to expect to think on your feet. You might have qs thrown at you during any of the tasks that are unique, unpredictable or difficult as you might not have an answer for it immediately, which i had to face too. Be open minded, imaginative and try to think of something relevant, even if its only 1 or 2 points. Also, be involved in every aspect of the ac. For e.g if they ask everyone how the ac went, make sure you say something. During the group exercise, if the assessors ask a qs, be one of the people to present an answer, and make it different from someone elses answer OR build on what they said with extra points. Be very agreeable and/or show respect and value to what everyone has to say even if you disagree with them.
I cannot give the exact questions or subject/content away for each section obviously. But these are my general tips that you can apply to a lot of ac's