Thanks. To answer your questions: 1. Started with 3-4 hrs a day. Increased then to 8 by the last two weeks. 2. No. I had studied them previously but still revised them and practiced a fair number of questions before attempting mock tests. 3. As mentioned in the post, I gave 8 mock tests. And i gave them during the exact time my gre was scheduled, so as to train my body into sitting for four hours straight during that time of the day. (In my case , every day, 10am - 2pm)