I find mock exam and unlimited practice exam are very different. I have been doing unlimited practice and getting fairly good score, but when I took mock exam they were questions I didnt see and more complicated.
Should I base actual exam with mock exam questions?
I've found an anomaly in the Space-Time Continuum. NASBA and the AICPA are in the 19th century. They use slide rules to score the exam, and then they send the scores by Pony Express to the State Boards. That's why it takes so long for them to do a score release.
In general, I took the MCQ practice tests on each section in Becker until I got over an 80% reliably.
The mock exams were much more difficult than the unlimited practice test MCQs for Becker. The actual exam was somewhere between the two on difficulty. As noted elsewhere you should score higher on the actual exam than on the mock exams. I think about 10 points is typical. There is a great post about this on here already.