I took it last year.
There are 6 different tasks.
Two of them ("independent tasks") simply ask you to answer a short question about general topics.
The other four are called "integrated tasks" because:
- two test your speaking, reading and listening skills together (you must answer two questions -- one on a campus-based situation and the other on a lecture -- basing your answer on what you read and listen to),
- two test your speaking and listening skills combined (you must answer two questions which require you to summarise a lecture and a talk).
You have only few seconds to prepare your answer, so you need to be very quick in organising your ideas! Also, it is advisable to become familiar with microphones and recordings ...
Finally, your answers are marked by humans (as for the writing section).
I suggest you check this website for more information.
Hope that helps!
(PS: Even though somebody says that you need to speak and write in AmE, they don't mind if you use BrE, as long as you're consistent with vocabulary and pronunciation)