Hi,
If there is only a few days left and you are especially concerned about the listening part, maybe it would be good to concentrate fully on listening stuff that is close to your level so you can gain confidence in your listening ability as much as you can. Maybe book a lesson or two with a Japanese tutor or a teacher here. I also think you can find the listening materials for past years tests online. It would be good to listen to those and do the practice tests.
Also sleep well before the test and be there well on time so you'll be as alert as possible and don't have spend energy on searching for the place in a hurry.
I took the JLPT N2 a few years ago. It was my first time to take a JLPT test and didn't quite know what to expect but it went well and I got a good score. I'd like to take the N1 sometime but the test is only done here once a year and when I remember it, the application period is always over.
The test takers were divided into groups by level and escorted to classrooms where bags, cell phones, etc. had to be put away for the duration of the test. It was allowed to have a pen and a sharpener with you and the test itself was mainly multiple choice questions. In the listening part they played a couple of discussions and then there were multiple choice questions about those. I suggest you read all of the listening questions beforehand so that you'll know what to pay attention to in the audio. If I remember correctly it was also allowed to make notes but you have to leave them to the class room when you leave.
Also the time can be quite short so I suggest you first go through all of the questions as quickly as you can and only answer the ones that you know the answers for right away without spending more than a couple of seconds thinking about them and then start from the beginning again to answer the hard ones.