If you passed Level 3 but are awaiting work experience to get your chater, would you have to still call yourself a “Level 3 Candidate”
You can say “Passed Level III”
I guess you are not a Level 3 candidate sinced you passed it, but I dont think saying it will be an issue since you would be on the more conservative side, if anything your making youself seem less valuable…
how about Joe Blow , CFA Passed Level III .
Is that allowed ? 
I will join Cat Fanciers Association and put CFA after my name.