And if you listen carefully, you will have a lot of teacher experience, which will be good for your future travel, such as how to make tourists shop reasonably from the perspective of tour guides, how to avoid price mistakes from the perspective of consumers and so on. If the economy and time permit, it is recommended to apply for class training.
If you just don't want to train, you can pass the exam by reading the whole book and giving detailed examples. Even if we don't know some common problems and solutions in people's daily travel, there is not much regret in textual research.