Target Test Prep : Good stuff !

A GMAT journey has many elements to it. I can vouch for TTP for clearing majority of the concepts for me especially quant. I love their error log and the fact that after every concept there is a test that you need to take in order to move on.

The best part about TTP is the scheduled approach. It keeps you on track. Also, the detailed analytics available gives you very pertinent inputs for you to get an idea of your deficiencies and strengths.
I struggled most with sentence correction and critical reasoning. Both were covered in a fair amount of detail. Also, the quantity of high quality questions available is really great. Gives you a good amount of practice.
Thanks TTP.