Can I come over with the photocopy of my certificate as I don't have the original and transcript handy

They will not accept photocopies. Only ORIGINAL TRANSCRIPTS from your school sealed in their envelope.

Yes, upload anything in their website and then they'll verify no need to see them they're very professional in what they're doing

Hi Wunmi, you do not need to even go there. You could upload the photocopies of ur credentials on their website while applying online.