My thoughts on preparing for this midterm.

I think that there are different test preparation strategies and that this class is probably at the far end of a spectrum.
In this class there is an emphasis on deep understanding of a few things and mental flexibility and insight, rather than on superficial familiarity with a lot of information. I think it is relevant for studying strategy.

To make a long story short, one can prepare for an informationally intensive exam by studying shortly before and cramming information into your short term memory which you then reproduce on the test. That won't work here since: that information won't be of much value, studying and storing information in that way may reduce you mental agility.

What I would recommend is to study, by working problems, and try understand as much as possible a few days in advance (especially today), and then, by Monday evening, begin to rest and reflect in a restful and not too intensive way. (And get a good night's sleep.) That may help you assimilate your understanding and be prepared to think.

PS. Small details you forget, you can ask for during the test. (But please do prepare a good equation card and do not take advantage of that too much. Mostly, it is to hep you relax and focus on the big picture.) You want to come to this test with your "big mind".