Preparing PSM II

Hi Folks,

I just completed my PSM 1 exam this Saturday. I am submitting my application for PST. Along with it, i have started preparing for PSM II exam.

I have read various threads on the forum about the preparation of PSM II, so i was looking forward for some advice around that.

1. Many threads suggest to read books in the Scrum and PSPO subject areas. Is all these books necessary to be read or someone can recommend a few out of them?
2. What other considerations and suggestions that can be provided along with it.

Thanks,