Hey there
I sat the Academic module of the IELTS test last July in France and I can tell you briefly how it went and how I prepared for the test (actually, you won't need much preparation if you are already proficient in English/ have a good level, and also depending on what's your targeted band score. To reassure you, most British universities will ask for an overall band score of 6.5/9 for entry into their undergraduate courses. However, some may set their English requirement a bit high, and I'm especially thinking of UCL and Exeter if I remember correctly (not quite sure about the latter though, will have to check!), which both request 7-7.5/9 in the IELTS as a minimum threshold for most of their courses. It's worth noting that oversubscribed courses like Medicine, Dentistry and Veterinary require a high competency in English). So, once the British Council will have received your application and forwarded it to your local test centre, a fairly enormous bunch of emails will be sent to you confirming the date and place of your appointment and other stuff (just the usual redtape, you know
). Your login details to the online IELTS preparation application will also be given to you. It'll enable you to practise the four skills tested in the test at home. I personally found it useful only for the listening and reading part since you would need a native to proofread your essay, and to converse with for the last parts of the test. If you are still at school like I was when I took the test, I'd recommend meeting up with your English teacher to practise your oral skills! For the listening section, practise hearing and writing numbers fast! The recording will only play ONCE, so yeah, do your best to get them right first time. I really struggled with this at first when practising at home. I mean I was so slow, especially with big numbers or addresses...
But now I think I'm doing fine! The reading section is a very good preparation for university: you'll have long texts often on scientific topics (mine was on some species of birds) then a wide range of questions to see how well you understood the text. Of course, skimming the text is strongly recommended and that's what's tested actually: how much information you can get out of a text just by scanning it. Some questions might seem tricky, but they truly aren't. It's just the wording that's weird.
I bought the workshop book to prepare at home. It's worth the extra euros or pounds! You even get a CD-Rom with it to prepare for the listening and speaking sections.
On the test day, I was quite relaxed although I arrived 5 min late because we couldn't find a parking lot - the perks of going to big cities, right. They'll do the usual ID check, etc. I remember there were mainly confident French students who were proud they were going to study abroad - so daunting (but now I'm proud to be the next generation to go! It's SO EXCITING. I've dreamt about it mostly all my life)... I was like the youngest to sit it. ^^ Just be calm and ready for the first section which is the listening test!
EDIT: Just realised you were already doing an undergraduate degree, so I guess your purposes must be different from mine.
Good luck with the test, though. If you love the English language just like I do, the test should be enjoyable overall, haha!