I could take the Master MECP test if i wanted to.
98% on basic
94% on First class
Honestly the test is highly overrated. I have worked with people who have been and haven't been Cert'd. And most of the MECP guys didn't know a thing.
I would suggest going to a School like installer int, or Mobile dynamics. But if you have questions ask away, Ill try to answer stuff from 7 years ago