There are no significant biological differences in Jews than in any other socially constructed group of humans.
As for reasons of Jewish success? I'd say that the power of being oppressed for thousands of years led them to become a tight knit group that was hugely supportive of each other. Each member giving proper support to what each member wanted to do, and this help and support allows humans to succeed and do marvelous things.
The lesson of the jewish people is that coming together and supporting your friends and family will lead to success for all.
Kasparov was A JEw????