Suzy,
You may have gotten a certificate from Michael's and in that sense you are certified, but you are not a Certified Picture Framer. Only the PPFA has the authority to grant that designation. In fact, I believe it was at least in part Michael's use of "certified framers" that led the PPFA to begin the process of getting CPF and Certified Picture Framer copyrighted, trademarked, or whatever.
The test you took was developed by Larson Juhl mainly for use in their training program and as a sample test to prepare for the CPF exam. They are the same type of questions you can expect to see, but it is not a CPF exam. With all due respect to Michaels and their framers, I seriously doubt they would expect their framers to know what materials are needed to reline a canvas. I have seen the Larson Juhl test you mentioned, and I can tell you that the CPF exam is much more thorough and rigorous.