The exam you are studying for is hard, and unfortunately it doesn't totally represent what real celestial navigation is like.

If you are using this course to learn actual practices and theory of celestial navigation, I highly recommend using the free companion class "Mastering Celestial Navigation" which is based on learning celestial navigation as a practicing navigator, from the beginning.

https://practical-navigator-training.teachable.com/p/mastering-celestial-navigation

If you are here to get ready to crush the CG exam, totally cool - that "Mastering Celestial Navigation" can help you, but is not required to memorize the recipe for the exam questions. The textbook is attached below for your reference library.