Manhattan CATs are quite good and you can count on its quant score. But verbal scores will be inflated, to be frank none of the test prep company mocks are as close as GMAT Prep in evaluating your verbal score. But other test prep mocks can help you narrow down to your weak areas. Within one week its quite difficult to make considerable improvement in verbal. You might be at the same level or some 2 or 3 points progress. Verbal improvement takes lot of time compared to quant. Work on OG problems, review each problem effectively. Approaching verbal is different from quant. You should be able to know why each of the wrong answers are wrong for verbal questions and you should also use elimination technique to arrive at the right answer instead of choosing a right one. Check your GMAT Prep CAT1 again and see if you can arrive at a weak area and work on it. Hope this helps !!

Thanks sam2304. I am guessing you are born on 23rd of June.
Much appreciate your feedback and i kinda second your comments. It would not be so easy to gain 8 points on verbal in just a week.
I am going about giving GMAT CATs every weekend and analyze my mistakes on each of them. Maybe later do some homework on these areas. I have signed up for Master GMAT free simulation test for this weekend.
Any comments on how good of a gauge it is ? Rate it in comparison to GMATPrep Software.

Don't take a mock unless you see yourself having made some considerable improvement after your last mock. The point is don't waste the mocks. I haven't used Master GMAT so I cannot comment anything about it. But if you are talking in terms of comparison with GMAT Prep then none will come as close to it. Even experts agree on that. Intermittently take up GMAT Prep mock so that you will know whether you are on track or not. Don't rely too much on other test prep mocks for evaluation. Don't save GMAT Prep for last minute preparation. You can take each test twice atleast to know where you stand considering a +/- 30 to 50 points deviation and after that the scores will be inflated.

I understand. Thanks a lot for your inputs ... Means a lot!