If you don't make a choice soon enough, you may have no choice, possibly not even of taking it in NYC. I would suggest not Manhattan, usually too noisy. Fordham's Rose Hill campus in the Bronx is quieter; if you can park on campus, drive rather than use public transportation. Consider a taxi. You don't want to be late to the exam; if you don't know your way around the neighborhood you might get lost and be late.
Consider Queens also, if there is a site.
Get to the exam site early, early, early. You want to check in and calm down before the whistle blows. Make sure you have filled out everything asked for, bring sharpened pencils per instructions, wear comfortable shoes and clothes, maybe ear plugs (but be careful not to miss the pencils down signal), even bring a pillow to sit on if allowed. Bring some energy supplies.