Distributions for Exam P

Hi,



I'm studying for Exam P in November, and I was wondering, which distributions are "necessary" to be completely, 100% comfortable with.



I have been focusing on the exponential, binomial, geometric, poisson, uniform, and normal, but occasionally, I see things like negative binomial, hypergeometric, gamma, etc. show up.



Is it worth it to just skip studying these more "obscure" in favor of knowing the others almost perfectly, or is it worth my time to get to know some of these less-familiar distributions?



Thanks in advance for any advice.

Distributions for Exam P