What are the challenges for improving and to be a best sales person in GCC?

The best way is to understand their culture. Middle east mandates knowing and understanding the people before doing any business.

I asked one of my best friends this question - and he is the best area sales manager in our company as well - he told me: 'Trust'. If your customers trust you as a person capable of achieving their requirements honestly and not only for taking money, your business will have good reputation and then cash flows to you. 'Trust' is one of the best things one can gain in any relationship, and it applies to professional fields as well.