On the 3rd of March, 2014 the National board of Medical Examination (NBME) has made some changes in the NBME practice exam forms designed for the preparation of USMLE step 1examination. Because there is a change in the minimal passing score for USMLE step 1, the National board of medical examiners has retired form 5 and 6 of the Comprehensive Basic Science practice exams (CBSSA) for step 1.
Comprehensive Basic Science practice exams (CBSSA) form 16 is now available for regular and expanded feedback from March 3rd. According to the NBME site, the CBSSA started after 3rdMarch will have a different longitudinal profile for performance due to changes in the minimal passing scores in the step 1 of USMLE examination. There are also changes made in the CBSSA scoring scale. The scores of the CBSSA forms completed before this date will not be rescored or compared against those started after March 3rd.
6 forms are available now for CBSSA step1 for 50$/exam. They are form 7, 11, 12, 13, 15 and 16. An expanded feedback form can be obtained for an additional 10$/exam.