What you *can* find are statistics about:
* Pass rates: Each state's bar examiners publish the pass rates for each bar exam administration. These rates can vary significantly based on factors like the difficulty of the exam, the demographics of the test takers, and the quality of bar prep courses used. You can compare pass rates between states, but it's not a direct ranking of the exam itself, more a reflection of the candidate pool and various other factors.
* Jurisdictional differences: The content and format of the bar exam can also vary slightly from state to state, making direct comparisons challenging. Some states may place more emphasis on certain areas of law.
In summary, while data exists regarding bar exam pass rates per jurisdiction, there is no official or universally accepted ranking of bar exams across the United States.