Apple Job & Apple Certification


I will go on interview for job in apple store.
Do you have some advise, tips about what kind of questions they will have on the interview?
Also I know they ask for certification like Apple Sales, MIB or ACSP. I already have ACSP 10.10 with help from iLearn: Advance ASCP application from apple store. and also my question is where I can get other certificates that I will need to get job in apple store.

Thank you