The official GMAT website offer a free software for users to download sample questions for practice purposes. Here are what's included in the software:
1. A 15-question practice section for each type of GMAT question, with answers and explanations for each question
2. 2 full-length computer adaptive practice tests with answers (detailed explanations of answers are not included)
3. Accurate computing of Verbal and Quantitative scores, which you can use to judge how prepared you are for the actual GMAT exam
A comprehensive math review
Real-time scoring