Hi, I'm from South Africa and I'm looking for A) an Online Six Sigma course B) the correct study material for Green and Black belts among the hundreds of available books and C) Is there a body (official)that governs the examinations/certifica

Hi, I'm from South Africa and I'm looking for A) an Online Six Sigma course B) the correct study material for Green and Black belts among the hundreds of available books and C) Is there a body (official)that governs the examinations/certifications? Thank you