They change it pretty regularly. Every 2 to 3 years I think. When I sat for it a few years ago, I was there for the first day they were using a new test.
The best solution for most folks is to do practice exams.
www.alliedschools.com had a great one that I used exclusively. There were questions that were word for word on the exam.
On the upside, the still use old questions, just add a bunch of new ones and change the ratios of question types in the new exams.
Assuming a normal test cycle, over 75% of brokers test taker fail. If it is a brand new test, that can jump to 80 or 90%
R