Is it possible for one to be an avid reader of all kind of books, skilled martial artist, master at playing chess as well as poker, skilled wilderness survivalist, hacker, and self-taught mathematician? If so, what can a person with these skills?

Yes, it is possible, but you´ll need to distribute the main acquisition of these skills over time.

An avid reader of all kinds of books: this is self-fulfilling when you learn the rest.

Chess master: (not grandmaster) If you are normally talented, will take 5–10 years, but best if you start as a child, maybe as early as 6–7 years. At this age, it is good if you practice it over a day. At the same time, you can build your foundation of physical fitness. Judo for instance is a great routine, it will help you to become a martial artist later.

Skilled martial artist: will take 1–3 years (with some foundation) and is OK to be done in late puberty (after the chess). At this age, the strength growth boosts too (you have already a good base from judo).

Skilled wilderness survivalist: doable as a hobby, learning theory spread over a few years, practical part as a vacation (perfect if after an extensive period of chess or poker.)

Being a good hacker: is probably one of the most challenging tasks, as this field evolves so much. I´d say it is a lifelong hobby. Assumptions are, that you are talented enough to grasp the school math and programming. In college, you should probably learn IT or math.

A self-taught mathematician: again the assumption is that you can grasp the school programs easily. I´d say it will take another 5 years and can be maybe done after the martial arts period. (You are in mid 20s now).

Poker is probably the easiest and most flexible of your ambitions, as this is not something you have to re-learn all over again. You won´t get rusty that easily. I´d say, if you have a character for poker, it will take 1 year to be a “master.” Playing good poker is not the same thing as grinding money with poker. It is not nearly as time-consuming as one could assume.

So yeah, everything is doable. That is of course, if you were reasonable and did not mean being a GRANDmaster and a world champion and a professor… etc.

What can you do with these levels of skills? Not much, but you´ll become an overall versatile person. If you are good at selling yourself, these skill levels are enough to teach other people. If you are charismatic on top of that, you may become a successful YouTuber in any of these fields.