You should be familair with SOAP1.1, WSDL1.1, etc speciafications and as well as their confirmance to WS-I BP1.0.
In the exam they will ask both.
For Example:
------------
a) Which one of the array definition is confirmance to WS-I BP1.0.
b) SOAP with attachments questions ( Attachments are not defined as part of BP1.0)
So its better to read both. Then only you will undertand the difference.
But most questions will be mostly related to confirmance to WS-I BP1.0