"The GMAC offers a range of resources for those preparing for the GMAT. The Official Guide to the GMAT and GMAT Prep are invaluable to students, and we strongly encourage our students to purchase and download these resources for their preparation. Another resource available to students is the GMAT Focus® Online Quantitative Diagnostic Tool, which provides students with an assessment of their math skills.

"In this article, I will discuss the different features of the GMAT Focus Tool, what is useful, and what I wish it had. I'll conclude with who I think this product would be ideal for."

https://magoosh.com/gmat/2014/review-of- ... stic-tool/

Cheers!