wich is the best oportunity to study in the UK a postgraduate biz program if. im from mexicoi could work?

Answer 1

If you come here on a student visa you will not legally be allowed to work. You must come with enough funds to see you through your planned period of study.
There are many opportunities, do some web searches for what you are interested in...;

Answer 2

There is a scholarship for Latin American students who want to pursue their university studies in Europe. It's called the Alban scholarship. For more information about scholarships, loans, etc, check out this page: http://www.macquil.com/scholarships.php