If you want Q90. You should buy this.

Looking to hit that Q90 mark? This question bank is a strong contender. The quantitative section is top-notch, offering a plethora of practice questions that not only reinforce concepts but also provide valuable tips and tricks to navigate tricky math problems. It's a comprehensive resource that can really boost your quant skills.

However, the verbal section could use some work. While it's functional, it doesn't quite match up to the style and difficulty level of official questions. Improving this aspect would make the resource even more valuable for well-rounded GMAT prep.

In summary, if you're focused on beefing up your math skills, this question bank is a must-have. Just be aware that you might need to supplement your verbal prep with additional resources to ensure you're fully prepared for all sections of the exam.