Hi yt770,
You mentioned some details about your study plans that should probably be "adjusted." When you take a CAT, if your goal is to receive a realistic score assessment, then you really have to be strict about HOW you take the CAT. The more the 'CAT-taking event' deviates from what you'll face on Test Day, the more likely the score is to be inaccurate (and in most cases, that means "inflated"). As such, you should make sure to take a NEW CAT each time, which the Essay/IR sections, away from your home, at the same time of day as your Official GMAT, etc. Retaking a CAT that you've already taken will almost certain lead to repeat questions. Seeing even a few of those repeat questions will throw of the 'realism' of the experience and your pacing, stress and energy levels will all be 'better' than they normally would be.
Beyond those details, it's important to remember that taking lots of CATs will NOT make you a better Test Taker. A CAT is really a 'measuring device' - when used correctly, it will give you a realistic score and help define your strengths and weaknesses, but it will NOT help you to fix any of those weaknesses. To raise your scores, you have to put in the necessary practice and repetitions. The CAT will show you whether your studies are helping you to improve or not. As such, you really shouldn't take more than 1 FULL CAT per week.
GMAT assassins aren't born, they're made,
Rich