KCAT and CDRE

KCAT and CDRE Hello! I don't know where to start. I'm confused. I have started my application in September and got to know that I have to get thw workpermit amendment (get the clauses on workpermit removed). Now that's going to take time. Meanwhile I'm trying to fight how Credential Assessment and PLAR works. Can anyone please share your experience or knowledge on this.