I agree with mantha.
'X', before making such strong statements please post your sources and the "unlegal books" or other things that you are talking about.
I believe that you can get a hold of any resources that anyone else has access to ... especially given the advancement in technology and document transfer over the internet.
Lastly, I don't see how it can make any difference if you have some more questions or material. Many guys have got excellent scores studying hard - not studying "unlegal" stuff. The OG is the only book with actual test questions. Any other material is just to help you and never the actual.
I would suggest you concentrate on your own efforts rather than these side issues for now. Also, if you want to see one of the reasons why Indians score more on GMAT take a look at the CAT questions, CAT is the entrance exam for TOP MBA schools in India ... it is atleast 3 times more difficult than GMAT. I know Indians who study from CAT before taking GMAT.