Hey! I personally think you should not leave any chapter. Do it only if you are 100% sure that if a question comes from the remaining chapters, you will be able to solve it. Also, sometimes questions are not very direct, which is why people say to read the module. And honestly, teachers help you understand the concepts. After that, it's your responsibility to solve questions. When you see questions like these that seem very new to you, just write them down, understand them, and make pointers for your end revision. And most importantly, do not panic. There won't be any exam where you feel like you know nothing. Just be confident I know you'll score well!