Hello
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I can help you out a little as I study a BEd in Post Primary.
Basically all interviews for initial teacher education, whether it be primary or post primary, use round about the same questions as they are interviewing you on why you want to be a teacher generally.
First off dress smart, but not bland. Wear some colour. NO JEANS OR DENIM of any kind.
My best piece of advice would be to prepare well before hand and get someone to do a mock interview with you, trust me it helps a lot!
The questions are a difficult one as they change every year and even change interview to interview. However, its always good to be prepared and have a good answer prepared for the generic questions such as; why do you what to be a teacher?; What qualities should a good teacher have?; Why you want to study at the certain university; Why you have chosen primary. I also had questions on the advantages and disadvantages of foreign students coming into UK schools, what advantages would a teaching placement abroad have for both your study of education and your future career.
Lastly, they will almost certainly ask if YOU have any questions at the end of the interview. ALWAYS HAVE ONE!
Hope this helped a little, and Good Luck in your interviews, I know how nerve wrecking it can be!