do a bend test, or just go pay the money at your nearest welding certification center to take your cert tests. Take tests for the same methods you weld with (eg. 1f, 2f, 3f, 4f, 1g, 2g, 3g, 4g, etc... and with the welding process you are using). If you pass the tests, then great...if you don't pass...well...
"No man's knowledge here can go beyond his experience." - John Locke
"Vi Et Armis" - Cicero