Highly recommend "uscg.com" for practice exams and researching USCG test questions for Deck
or Engineering, any tonnage or horsepower rating. For $15 for a month's access, you can take practice exams or research
an individual question. It's particularly valuable to access a USCG question by number and get the correct, approved, USCG answer. It's not bombproof but, in my recent experience, it is 99% correct.
Of course, you should double-check every response through a second source but uscgq.com was a tremendous resource in my recent Master MMC renewal.
I have no interest in the outfit, just a very satisfied $15 customer.