If you love and enjoy maths, you wont find it too bad at all! Chapter 12 is very easy, its literally some bookwork with some lognormal questions.
Don't bother trying to understand the 5-step method chapters too much, as it rarely comes up.
I barely read the core notes, but did every single Q&A section, along with online classroom and past papers. I then looked at core notes when I got stuck on any questions so it was like backwards method of studying - its so much faster (for me anyway)...
Last edited: Dec 15, 2020