You can get a idea of what the test is like from here....
http://www.hamtests.co.uk/
Foundation is as has been said a introduction...very basic and easy....
Intermediate is more technical and hands on electronics wise (found it harder but fun

)
Start the advanced course in September (instructors, all over 70, like to go on holibobs through the summer for some reason

)....
Found my local club a great help, as the accumulated knowledge of all the old farts

was immense......