2 schools in Phuket, Thailand run RYA Yachtmaster and MCA OOW (Yacht) Training Courses. Compare them here, then book direct with the school. YachtSync lists every provider free and ranks none of them by any commercial arrangement.
About the discount codes above. Codes are agreed directly with the school and the saving comes off your price. YachtSync earns a small commission when a code is used, at no extra cost to you. It never affects how schools are listed or ranked. See all crew discount codes.