If you live in Dominica , then you'd most likely come to the US to take the exam. If you don't already have a US visa then you would need to take to the interview everything you have to prove you're scheduled for an exam. In addition to what you've stated that you're taking with you , I would also print a copy of the appointment date set with Pearson-Vue. The US wants to ensure that you will return to Dominica after brief stay, so take as much documentation that you have to prove ties to Dominica eg. car note, mortgage etc. Good Luck. HTH