some more

http://www.bestsamplequestions.com/

http://www.platinumgmat.com/practice_gmat_questions/

http://www.questionbank.4gmat.com/mba_prep_sample_questions/permutation_combination_probability/

http://www.google.co.in/search?hl=kn&q=GMAT+questions&meta=&aq=f&oq=