I found the hand-outs from last year and the guide they give you is about version 5.

http://www.edexcel.org.uk/VirtualContent/29839.pdf

This is the course I am doing. You don't all the units.

I did 1, 2 ,3, 9, 12 and 13.

I will be doing 4, 5, 6, 7, 14 and 16.