A very useful analytical tool

I find E-Gmat Quant Scholaranium a perfect instrument for studying.
You start with initial ability test to find out how good you understand each section. It shows you all the required data: types questions, complexity, topics, your accuracy, how effectively you use your time, and a lot of other points that could help you to fighure out your strength and weaknesses.

Quant Scholaranium is very flexible: you can create your own quizzes on topics that you've just covered or the quiz with questions of the same complexity.

Scholaranium is a great analytical tool that helps you to achieve your target score. It covers some additional aspects that can affect you score, such as timing issue and focusing.