hi marcio!
i used different free mock
test, but i can not post the name of the sites.
But if you search in google the words "ibm 000 834" you can find very useful links.
Thanks to free mock tests, i think that 90% of the exam objectives are covered. you could focus your study only on things about questions of free mock tests.
hope this help!
GiUsEpPe (SCJP, SCWCD, SCBCD, IBM OOAD, SCEA/OCMJEA 5)