There is a very good website www.theBPSTpartnership.com who supply books of practice papers for bookkeeping level 1 to 3 exams (manual and computerised).
The books contain 5 full mock papers and solutions and are very similar to the actual questions which are set in the bookkeeping examinations (both online exams and written exams).
They do cost around £20 each but they are excellent practice towards bookkeeping exams.