GMAT club tests are designed in an optimum manner trying to mimic the actual GMAT test. It is the closest you can get after the official GMAT prep software. It gives amazing analysis post my tests. I have the option of picking the difficult (700 level) questions and making a question bank out of it. And later revisit the questions when you are free. Also I have an option to create customized quizzes on select topics. It is really helpful. The GMAT club tests give you fairly accurate representation of your level. What I love most about the GMAT club tests is that the questions keep on updating. Thanks to users like BB, Bunuel etc. and the explanations are plenty. So, you can pick the one which you can understand the best. That is a fantastic option which many other services don't offer. And hence, my allegiance to GMAT club.

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The manhattan prep self-study tool kit is an excellent resource for quantitative aptitude. It is not all that great for verbal, in my opinion.
It includes the following - You get 12 Manhattan GMAT Books + 3 Official Guides
- Includes a one-on-one session with a GMAT instructor
- Includes GMAT Navigator tool
- 5 Video lessons from GMAT Interact
- 6 Manhattan GMAT CATs + online quizzes
- 6-month access to GMAT Club Tests is included, a $250 value

The five video lessons were really helpful. Also, the 6 tests are quite high in rigor. It may not replicate the exact GMAT level but will give you a fair estimate on where you stand.

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