If you are planning to take the MPRE in November 2016 (it is offered three times/year), the deadline for regular registration is this Thursday, September 15. Detailed information about how and when to register, fees, deadlines, etc. is on the National Conference of Bar Examiners website. From that website:
The Multistate Professional Responsibility Examination (MPRE) is a two-hour, 60-question multiple-choice examination developed by NCBE that is administered three times per year. It is required for admission to the bars of all but three U.S. jurisdictions (Maryland, Wisconsin, and Puerto Rico). (In addition, Connecticut and New Jersey accept successful completion of a law school course on professional responsibility in lieu of a passing score on the MPRE.) Because MPRE requirements vary from one jurisdiction to another, examinees are advised to check with the bar admission agency in the jurisdiction to which they seek admission before registering for the MPRE. Passing scores are established by each jurisdiction.
Remember that from now on, you will have various deadlines and requirements to meet for purposes of registering for, preparing for and taking a bar exam. It is your responsibility to research and keep up with those requirements, including by getting information directly from official sources. The only authoritative official source of information about the bar exam and bar admission in a given jurisdiction is that jurisdiction’s own Office of Bar Admissions or Board of Examiners website. Please make sure to bookmark the one for the state where you plan to take a bar exam, create an online account if that is available, and check both regularly. If you’re taking the November MPRE, good luck!