All,

 I am in search of tough PMP test questions. The tests that i have currently taken are

1. http://www.oliverlehmann.com/pmp-self-test/75-free-questions.htm
2. http://www.pmtarget.com/free_sample_pmp_test_questions.aspx
3. http://www.pmstudy.com
4. Tests in Pmzilla.