The faa issued me with a restricted commercial licence, with the restriction that I can not take pax + cargo for hire or reward.
To remove that restriction I had to do their commercial test, (both theory + flight).
These days, the faa aren't issuing these restricted commercials, so you can expect to do the flight + theory test.
I studied the PTS, (see above), and then did a couple of flights with an instructor to get a grip on their manoeuvres required for the test. Scheduled it, paid the DE fee and it wasn't a problem.
cheers abroad