Course Material - Quant

I can understand what you're trying to do (although I don't recommend this approach to my students). Whatever suggestions you get here, just keep in mind that the classification will be, at best, unreliable. Even the official questions (OG online access and the questions in the GMATPrep practice section/question pack 1) are divided into only 3 categories. The GMAC does not release the information needed to categorize questions any better than this. Additionally, no test prep company has access to the same set of test takers as the GMAT does and not even experts can be relied on for anything other than broad calls on item difficulty.

It's usually better to just work through high-quality (and representative) material, and then test yourself on the GMATPreps.