Are there any sample/mock exams for 287/484/486 around?
There are no currently free mock exams for 287 or 484 on the Internet. For each test, IBM provides a sample one available at Prime: http://ibmtesting.prime.prometric.com/ The test fee is USD 10. You can also purchase simulator from Whizlabs, now available for tests 158, 484 and 486. Check out the latest updates at http://www.whizlabs.