The HAM test question bank is released in advance, there are no surprises. You get a test of 35 random questions from the bank of over 400, one from each study section. There are phone apps, YouTube videos, and a variety of web pages to help you study. Local HAM clubs may offer study sessions. Tests are offered pretty much every weekend within driving range of most people. The test is usually free, but a small administrative fee can be charged.
I used a YouTube series and phone app to study with, I was ready in about 2 or 3 weeks, and I passed on the first try. The basic goal of the test is to set the minimum level of knowledge, provide a basic understanding of rules, and them encourage experimentation; this is why the questions are released in advance of the exam. This isn't one of those tests where they dig the most obscure reference from the deepest, darkest paragraph in a footnote buried in the appendix.
Besides common 5.8GHz FPV use, HAM opens up a wide variety of frequencies for our hobby, such as long range control in 433 and 900MHz and long range video in 1.2 or 2.4GHz. There are inexpensive 400MHz tracking beacons that can easily be added to aircraft to greatly minimize the chance of a lost model. HAM opens up many more options than just park flying FPV planes. Even if you don't want to fly long range, these still come in handy in Rf noisy environments where the 2.4 & 5.8GHz bands may be saturated.