When I first did a post on the requirements of the RPR test (on 6/19/12), (Click Here), the written knowledge test was comprised of 105-110 questions that was based on the following four categories and percentages:
Reporting (48%)
Transcript production (44%)
Operating practices (4%)
Professional issues and continuing education (4%)

As of today, the NCRA website states that the written knowledge test is comprised of the following three categories and percentages:
Technology (22%)
Reporting practices (62%)
Professional practices (16%)

I hope that with the changes there is an updated study guide. If anyone has any information about an updated study guide, please let me know. Thanks.