3 Days is a bit late?! - boy, you would have cringed at my study habits in grad school Mzdivine!!
I think qazrazl and lilannie's ideas are great - the only thing that I would add would be to see if you can come up with some mnemonic devices to help you remember some of the material.
For example, my 4th grader just had a test about the parts of a flower - we came up with SOPSPAS (soap spas - she thought it was funny - so she definitely remembered) - sepals, ovary, pistil, stamen, petal, anther, stigma (and we also noticed the male part of the flower - staMEN and anther (like antLERS) and female - stigMA - LOL). It seems silly, but hey, I still remember the sentences I learned to remember the notes on the Treble and Bass clefs!!
Reread the material. Make notes while reading. Study the notes. And study the notes you took in class.
Study must be completed previously. Now are the days for relaxing, entertaining, strengthening confidence.
Because its 3 days away...just review the things you know fairly well. Hopefully you have been studying the hardstuff first...?
go through all your notes and rewrite everything you need to know in outline format. Writing and organizing always helped me to remember.
Absorb the material as best you can.
A bit late,isn't it?
No use in cramming too much NOW!!
Speak all of the info onto a tape. Then play the tape on repeat while you sleep.