Studies by the Confederation for Unity, Recognition and Advancement of Government Employees (Courage) and the International Seafarers’ Action (ISAC) Philippines Foundation, Inc. show that the government rakes in billions of pesos from mandatory exactions on prospective overseas Filipino workers (OFWs). BY NOEL SALES BARCELONA Correspondent MIGRANT WATCH Bulatlat Aling Rose (real name withheld upon request),…