For big exams when I need to study huge amounts to a deadline, I go to bed super early and sleep the four hour REM sleep cycle. Then, I wake up, drink a huge cup of coffee , and study right down to the wire of the exam, and everything is fresh in short term memory. It isn't obviously the best way to learn, but it is kind of exhilarating. I believe you can pass this test, especially with the great support you received here, and your T being kind of heroic from out of the country bc he obviously cares. Bed. Sleep. Coffee, Study right until the deadline.