Where are you studying and which exams? I don't think there are any standard specimen papers as each provider sets their own. For example, for BPP all their practice papers are on the Hub and I've not seen anything available beyond this.
I'm with University of Law and they've given me one mock paper and one specimen however it doesn't cover much. So I was wondering if anyone had any old specimen papers etc so I could practice as many of the topics as I can before the CPA's in March.