I'm doing my gcse english exam on wednesday and I still have no idea what this shit is.
I don't know what board you are taking but if it is like the one I was helping someone out with the other month (and it should be) then get the example answers/what they expect to match and look at those. Do a few different years and it should become obvious enough what they are seeking, especially "here is a passage, here is a 'student's' description, do you agree" aspects (short version is there is going to be something to disagree with/that fails to account for nuance, find it and explain it, including picking out and quoting examples of adverbs, adjectives and such like to support it even if you don't think it necessary) which the earlier passage is pretty much prep for such questions.
For character analysis I also like
Don't have to do a full one but a quick outline will help you immensely. Basic plot of relationships between characters is also helpful if you can do it. Do dry runs on any books, TV shows, games, films or whatever that you like to get into the flow of doing that, or a simplified version thereof.
Alongside that then "who, what, why, when, where" and possibly how is a reasonable means of analysing things. Alternatively "means, motive, opportunity", especially if it is crime related.
I can go further but I will leave it there for now. I don't know if the exam board specifically teaches PEA from the last one but I don't find it a great means of analysing things, that said as I said back then if it is what they want but that seal that claps and balances a ball on its nose -- it is not hard to be smarter than an examiner or teacher but showing you are such will not get you places just yet. Do however make sure you have the ideas of adjectives, nouns and verbs, and adverbs, on lock and be picking them out.