It's version 6 of the Central Question Bank. We're now using CQB13 in the UK and CQB14 has just been issued, it may already be in use in some States. The Volare bank still contains many relevant questions but many of the more contentious ones have been removed in current exams, particularly in Air law, and many more have been amended and added in. I'd guess about 900 questions have been taken out or amended and 700 to 800 added in up to CQB13, possibly more. With those caveats it is still a reasonable revision aid. Many of the free 'question banks' floating around are bulked up with progress test questions from OAT and ourselves from the early days of the JAA exams. The Volare bank is usually in PDF format with 'Volare' or 'Professione Volare' on each page. If yours is like that it's not bulked out, it's pure CQB6.