There are not any practice problems that I'm aware of. The github repository has the examples available in code form, which seem to be being maintained, and the errata, but I'm not aware of any problems specifically formulated for the book.
You could convert the book into a set of problems by reading the chapters, writing down what the sample code does somewhere separate, then close the book (and the github repo) and then reproducing it yourself with as little reference to the book as possible. You may think "but I just read the answers, it won't be a real exercise", to which I would say, try it first.
Thanks for the response. I think that repo help me in learning. But i don't know how much i can do. As a fresh graduate doing intern i am worried about my career in this AI era. I make a plan for me which is finishing this book and continue learning terminal, git, docker then do Cisco Linux Unhatched course. This is for start eBPF learning journey.