The MPRE is required for admission to the bars of all but three U.S. jurisdictions (Maryland, Wisconsin, and Puerto Rico). A list of jurisdictions currently using the MPRE is available on the MPRE FAQs page. Passing scores are established by each jurisdiction. Since the MPRE requirements vary from one jurisdiction to another, examinees are advised to check with the board of bar examiners in each jurisdiction where admission is being sought before registering for the MPRE. Contact information for jurisdictions can be found in the Bar Admission Offices Directory on the home page.
The Multistate Professional Responsibility Examination (MPRE), developed by the National Conference of Bar Examiners (NCBE), is a 60-question multiple-choice test given over two hours. Students usually take it well in advance of the bar exam preparation timeline. The exam is designed to test the taker's familiarity with the Model Rules of Professional Responsibility, the ABA Code of Judicial Conduct, and various court decisions in the field of legal ethics. A detailed subject outline is available here.
For general information on the MPRE, see the MPRE website.