The problem in English (as an examiner and teacher) is that there ARE no "buzzwords". The examiner is looking for you to clearly show that you understand WHAT the writer is trying to do and HOW they are doing it.
Make him READ. The more you read, the better you are at the subject. It is an exam in reading, and then writing based on the skills and the good practice you pick up as a reader.
The examiners reports are more helpful than markschemes, I would say.
One unhelpful "tip" that people often offer is picking out "techniques". We don't care that much if you know it's a simile, metaphor or the dreaded alliteration. We want to know WHY the writer has used that word/phrase.
E.g. summer 2018 paper - "mr Fisher remembered a time when books were golden".
Answer A: the writer uses a metaphor when he says "books were golden".
Answer B: when the writer says "books were golden", the word "golden" makes me think of treasure which suggests books are valuable
Answer C: when the writer says "books were golden", the word "golden" makes me think of treasure which suggests books are valuable. In addition, gold is usually used as first prize, which makes me think that books were something to be celebrated, almost like winning a competition.
A - grade 3
B - grade 5
C - grade 7