Where could I get free MBA education?

-I have a B.S. degree in mechanical engineering and I am very enthusiast to study MBA business branch .Nowhere. The MBA is never free. Someone pays for it, even if you get a full scholarship. Explore the Official MBA Guide. It's a comprehensive free public service with more than 2,000 MBA programs listed worldwide. It allows you to search for programs by location (US, Europe, Far East, etc.), by concentration (finance, marketing, aviation management, health management, accounting, etc.), by type of program (full-time, distance learning, part-time, executive, and accelerated), and by listing your own criteria and preferences to get a list of universities that satisfy your needs. Schools report their accreditation status, tuition cost, number of students, class sizes, program length, and a lot of other data. Schools provide data on entrance requirements, program costs, program characteristics, joint degrees, and much more. You can use the Guide to contact schools of your choice, examine their data, visit their web site, and send them pre applications. You can see lists of top 40 schools ranked by starting salaries of graduates, GMAT scores, and other criteria.
Nobody is going to give you a free qualification that you can use to improve your earnings ability, who would pay for that? If you want to learn finance cheaply, do the CFA in your spare time.