There is little more than that to it. If you are new to CSS, I would suggest that preparing the whole syllabus for any subject is rarely a good idea for most candidates. The syllabuses for all subjects are quite vast so you have to do selective or “smart” study.

Now in case of statistics, I assume you would already know a fair bit descriptive statistics. So in my opinion, you already might have a staring point here that you may not have in other subjects.

If you do opt for statistics, get Sher Muhammad’s books. Follow the examples and you would be good to go. Exams questions are mostly taken from this book directly.