When I got my certification I had to take a class and pass the tests for type l, type ll & type lll but I think all you have to do now is pay 20 bucks and do it online.
http://www.epa.gov/ozone/title6/608/technicians/certoutl.html
if you have electrical background you should do OK because about 80% of airconditioning/refrigeration problems are electrical related.
http://www.epa.gov/ozone/title6/608/technicians/certoutl.html
if you have electrical background you should do OK because about 80% of airconditioning/refrigeration problems are electrical related.