Why don't you take A2 instead of A1? That's much better in case you want to stick to DELF exam. Though as PMM mentioned, contact Alliance Francaise to see if you can take TEF. That's the best decision.
This is the details I found on internet:
Alliance Française Dhaka
26, Mirpur Road, Dhanmondi R/A
1209 Dhaka
Bangladesh
Phone: 880-2 . 8611557