I think if you need to ask, you might not be ready. A test is a test. Some people are good at a test, others get a lot of anxiety from any kind of test. To ask a blanket question like that is not going to get a simple answer as it is as easy or hard as you make it with either being prepped or not being prepped., how hard is the test ? really .
If you are already a regular pilot, familiar with aeronautical charts, it won't take much study to be up to speed on UAVs and pass the test. A lot of questions have to do with reading those charts and knowing airspace.
Good luck.
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