If you would like to see where you stand, there are quite a few Tests you can use. The best predictor of your actual GMAT score is GMAT Prep software. It was developed by the creators of the GMAT. Here's a link to reviews of different sample tests you can use:all-gmat-cat-practice-tests-links-prices-reviews-77460.html
We also have our own GMAT Club Diagnostic Test:gmat-diagnostic-test-quest-for-best-gmat-diagnostic-test-79502.html
This diagnostic test can be taken online in a timed mode or offline using a PDF downloaded from the above link.
Have a good prep time!
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