Hi LHC8717,
Test Day is a rather specific 'event' - the details are specific and they matter, so you have to train as best as you can for all of them. The more realistic you can make your CATs, the more likely the score results are to be accurate. The more you deviate, the more "inflated" your scores can become. If you ever skip sections, take a CAT at home, see 'repeat' questions that you've already answered, etc. then you are not properly training for the FULL GMAT 'experience.' By extension, any score result from those experiences is likely inaccurate.
Right now, there's some question as to your actual ability level, but it's probably in the mid-500s to high-500s. To improve to the 740+ level, you're going to have to make some significant improvements to how you handle BOTH the Quant and Verbal sections. All of that work is going to take time - likely another 3 months of consistent, guided study. This is meant to say that you should consider pushing back your Official Test Date.
For your next CAT, you should make sure to take it in as realistic a fashion as possible (so take a NEW FULL CAT - with the Essay and IR sections, take it away from your home, at the same time of day as when you'll take the Official GMAT, etc.). Once you have that score, you should report back here and we can discuss how best to proceed).
GMAT assassins aren't born, they're made,
Rich