I took the IELTS in May in British Council. All of the candidates registered got access to 40 hours or so of 'Road to IELTS' materials - these provide a lot of videos in which teachers give advice about how to pass the test with a good grade. There are also some interactive exercices. It gave my a lot, particularly concerning listening and reading sections.

So read your e-mails, maybe you also have an access to that.
I brought just my passport and a bottle of water. We were given stationary (a pen and a pencil with a rubber on one end) and we were told to use the pencil to fill in answer sheets for listening and reading. As for writing, you could write either in pencil or in pen. If you wanted to sharpen the pencil you could ask one of the invigilators for a pencil sharpener, they also had additional sheets for writing tasks. You don't need to know your candidate's number etc. as everything like that was provided on a sticker on your desk. The invigilators were very nice and told us how to put your name and all the codes on the answer sheets, so don't worry about that.
There were no real breaks between parts - only when they went round and collected the answers after each part, but we were asked to stay in our seats and not to speak with anyone. You can go to the toilet during the test - I wouldn't advice that, though, as there is really little time, especially during the writing part!
Speaking was fairy relaxed. First I came to the registration room, they took a photo and checked my passport, then I waited for a couple of minutes and finally I was told which room I'm supposed to go to. The test starts with a few casual questions, maybe something about your school, your hometown, your family etc. Then it moves on to a kind of a presentation - you are given a topic and a set of questions and you need to talk about it for about 2 minutes, trying to cover all the bullet points. You will be given a piece of paper and a pencil to make some notes (you have 1 min preparation time). Then the conversation moves on and is linked to the topic you presented.

The most important thing is to keep speaking (although as correctly and coherently as possible

). But, as it was already pointed out, you don't have to tell the truth - for example if they ask you about a film you didn't like and you can't think of anything just use your imagination.

.