Guys I have my test on the 16th for accounts branch. I have a little problem. I do not have any equivalence for O level or A Level because I never needed them. I have a BSc from University of London. Can anyone tell me will I be allowed to sit for the exam in the first place?

If yes, then please tell me how to prepare for the academics test? N how difficult are both the tests? Also, tell me do they do the initial medical immediately after the exam or later date? Also, tell me can flat foot become a reason for rejection given the fact it can be treated?
Thank You.