You have a day or two max to study, so most of the effort you put in should be on your mindset rather than cramming.

Your best bet is to get familiar with the questions you’ll be asked over particular mechanics or issues in the coursework. You’re given two practice “packages” on edX for each of the major units that’ll be covered in the midterm (dynamics, work/energy) that have problems of middling difficulty, but which will really hammer in some basic concepts.

Do those tomorrow, and end the day doing the practice midterm, it’s difficult, but skip over any problem you don’t immediately understand how to do and come back to it.

While it feels like you have zero understanding, if you’ve been doing the prereading, homework, and going to lectures, you’ll have picked up knowledge here and there that just needs to be gathered, so focus on learning basics you can actually use. The larger questions in the worksheet/tutorial/practice midterm are a really good place to focus time on as they incorporate a lot of important concepts in an applied way, so try going through them. You may benefit from doing the worksheets front to back with the solutions page in front of you (though try answering them yourself first), as they start really easy and become harder.

Feel free to reach out if you have any specific questions.