Thank you for your interest in Marlins Online Tests.
As an individual, it is the best if you could confirm with your future employers which certificate do they require. Some Flag States and companies insist the test must be sit in one of our Approved Test Centre (http://marlins.co.uk/testcentres.htm). Your certificate will be stamped and signed to certify the test is done under strict exam condition. For cost and availability of each ATC, please contact them directly.
Otherwise our tests are purchased through the Marlins online test site using a credit or debit card transaction http://www.marlinstests.co.uk, and the tests are carried out online. Once you complete the purchase, you can immediately start the test and print out certificate after completing the test. The cost of each Test for Seafarers is USD 15.