Every chess player think he is very clever but only in chess
How is chess good for the human brain?

Chess should not be taught in schools. And National Chess Championship of schools and universities is a distraction to participants. All those training and preparation is a big waste of time.
It could be if your not into a career of chess.

Every chess player think he is very clever but only in chess
Some people that play chess are actually smart in many fields. However that depends on the person himself.

Chess is good for your brain in general, but it might not be so good to think too hard trying to find good moves, specially in long time control games.

Chess activities should be limited to 1 to 2 hour daily. Excess give diminishing returns to brain health.
Chess should not be taught in schools. And National Chess Championship of schools and universities is a distraction to participants. All those training and preparation is a big waste of time.