A walk through Combinatorics Review

[Mohamad Ternanni]

Hello, Can anyone give me his/her opinion on the book "A walk through Combinatorics" by Bona and how relevant is it for a quant. I am currently self-studying probability. I did all counting problems in "Introduction to probability" by Blitzstein but I am not satisfied with my performance. I did most of the exercises correct but I feel I need to improve in counting. The book is intended to be for one or two semesters so if there are some irrelevant chapters please help me point them out so I can give more time and effort to the relevant material.