Hey! I think you should take a look to this post on the forum: Sensory Trainning
For the knowledge exam, it’s a general one but a worldwide one. I’ve seen coffee professionals from producing countries failing the exam as not being aware of coffee varieties of other countries or coffee history, for example.
This bibliography is recommended and I encourage you to have it and read it but if you are into coffee I certainly can tell that if you feel well educated on the matter you have good chances.