Using a testing app is ok but they do not explain why the correct answer is the correct answer, so basically you are forced to memorize the rules.
This is not a problem with the simple rules but the real coast guard test has many difficult questions that need a good instructor to explain both what the question is asking and why the correct answer is the correct answer.
Example what Identifying sound signal does a 50 meter
fishing vessel at
anchor sound in the
fog?
a. 5 seconds of rapidly ringing of a bell every min.
b. 5 seconds of rapidly ringing of a bell followed by 5 seconds of a gong every min.
c. short, prolonged, short blast on the whistle every 2 mins
d. One prolonged followed by 2 short blasts on the whistle every 2 mins.
The correct answer is D. because to be a
fishing vessel you are engaged in fishing.
You still have all your fishing
equipment in the
water fishing and you are only using the
anchor as another fishing tool.
So you do the identifying signal for the fishing vessel NOT for a vessel at anchor.
With that said here is the USCG practice testing site
https://www.uscgq.com/uscg-rules-of-...-practice-test