You can go on ecda website to register your interest. You are allowed to choose up to 10 preferred centres and when they become available, you'll be contacted. I have been contacted by a few centres of our choice when on waiting list for a month or 2
I put in my requests in ECDA at few centers but on waiting list. Finally walk in to one and lucky there was a slot for our lo
Yes, I went to apply in person and was placed on the waiting list. Got it after a few months.