The window for taking the final exam is April 28 - May 6. The time limit for the final exam is 135 minutes. And the final exam is cumulative, i.e. it covers the entire course. However, it is more concentrated around Part 6 since Part 6 has not been included on any of the 3 regular tests.
Your final grade will be based on work completed by May 6. Getting your work finished by then is your responsibility. So if you have an excused absence from an earlier test and haven't made up the test, it is your responsibility to contact Dr. Page and get the missing work scheduled.
All homework extensions will be shut down when the final exam window opens. So be sure to complete your homework by April 28.