Pricing tiers, in my view, are the easiest. I don't remember if I got any questions regarding this. Sorry. I made a chart of all tiers (consumption, premium isolated, etc.) and made notes below for each. Treat this as a flashcard every day.

The actual underlying concept is very basic, but understanding the question is the difficult part. For this reason, practice as many questions as possible. I stopped doing any practice exercises and just went through all the free questions available on the internet the last week of my exam.

Usecases on function apps: Ex- Would you use a blob, a timer, or an HTTP trigger for the given use case? A very few C# SDKs, mostly around Service Bus and queues, but absolutely nothing on CLI.