When at the beginning of the learning curve, many students start with a Google search and wade through all the different sites that have content on the patent bar. Since you want the most up to date content on requirements and specifics about the exam, consider starting with official pages at the USPTO.
The start page at the USPTO is Registration examination . It has sections that include links to essential content:
Application and Registration Process
Notice Regarding Registration Exam Scheduling
Applicant Portal
Registration examination questions
Tutorial
Exam statistics
Notice of non-disclosure agreement
Review sessions
Examination updates and source materials
Routine Processing of Certain Documents Submitted to the Office of Enrollment and Discipline
Becoming a patent practitioner
THE SOURCE MATERIALS FOR THE QUESTIONS AND ANSWERS ON THE REGISTRATION EXAMINATION
USPTO Examiner Training Materials
These modules are used to train entry-level USPTO examiners and are super comprehensive, especially in breaking down MPEP chapters and breaking down material into simpler terms. Also, since they're aimed at examiners, they provide really great perspective into how an examiner thinks, which is super helpful during the exam!