To the Original Poster:
You make index cards with the pertinent info on them. And you look at them every chance you can get. When you are in the can, when you are on a break, whenever you have a free moment. When you are in class, you sit in the front row and hang on every word the teacher says, the teacher is basically giving you the info that will be on the test. Pay particular attention to when the teacher pauses to look at her notes to read something, THAT SOMETHING WILL BE ON THE TEST.
If you have a relatively mindless job, like unloading, you can occupy your mind with the info on the test.(Just keep some index cards in your pocket It's still early November so you have some classes and time left. Preview , scan the upcoming material in your textbooks for the material that will be covered in the coming week(s). You'll be amazed what your brain can do for you. Practice the mnemonics game. Make acronyms, word games, anything that allows you to assimilate the material. Verbally record some info on your smartphone or computer and make mp3s that will be on your smartphone. Play it and hit repeat. That will sink some info into your head.
I don't know if you plan on going to grad school or not. If not , the difference between a B and C plus will probably mean nothing. But I think , based on your one and only post, that you have enough academic skills to ace these tests. Take a look at your fellow students. Overall , I would bet that it's the ones that are busy IN class and outside of class are the ones that are doing well.
I saw this video yesterday, someone posted it on another thread. You might view her as a member of the dark side of management but she makes some valid points. And she walks the walk, I can hear her early past in her voice . By the way, I looked her up a little and she got her Master's degree while working at UPS( and I suspect while she was full time).
So be a scrapper, not a crapper.
As for your need to take off that whole week. How about a few days? How many sick days do you have left? If any , take them then. It may not give you a whole week off but it would give you some time off. You're selling yourself short, you can do this. I get it: management gave you a verbal promise and now they are reneging . Get past the anger and channel that energy into learning the material you need to learn.
Win Today, fight tomorrow (tomorrow being your exam days).