Given that there are web sites the post the correct answers to the sample tests, I doubt IBM would just blanketly offer free tests just for getting a good score. Every once and a while IBM gives free vouchers to the first X number who pass, but those usually are gone in the first few days.
Scott Duffy<br />:: MCSD, SCJP, IBMXML<br />:: Author of <a href="http://www.xguru.com/tutorial/cat_index.asp?cat=5" target="_blank" rel="nofollow">IBM XML Certification Guide</a><br />:: Author of <a href="http://www.amazon.com/exec/obidos/tg/detail/-/0072228873" target="_blank" rel="nofollow">How to Do Everything in JavaScript</a>, Osborne Press