Exam centres in Bangalore

Hey, so I'm about write my ACCA exams I September and have planned for my December exam and have to book that I wanted to know a few things about the exam centres in Bangalore

1. How many exam centres are there in Bangalore actually and where are they located

2. I can personally see 3 exam centres on the ACCA portal (near Peenya, HMT layout, RV engg college), are there any other exam centres in Bangalore apart from these, and which one is best among them

3. Some exam centres have no availability from day 1. I was trying to book my December exam yesterday, 1 day after bookings were open, and the RV engg college centre was showing as unavailable. Is this a system thing or do these centres open availability at a later date or are so many people applying that it got filled in 1 day

I've been having difficulties with these aspects of booking an exam. It's also my first time writing the exam so I don't really know what to do

Thanks for any help I can get