Hi RAHUL123124,
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 practice scores can become - and that's what happened here. By taking the CATs at home, taking them at different times of day, pausing the CATs - and anything else you may have done that did not 'match up' with the parameters of Test Day - you weren't properly training for the FULL GMAT 'experience.'
Test Day involves a variety of really specific steps and parameters (including steps before the Test even begins - such as leaving your home, traveling, etc.). Every factor matters, including the psychological ones. When you sit down on Test Day, you KNOW that you're going to be in the Computer Lab for about 4 hours - but if you're just taking individual sections (or taking long pauses between sections), then you KNOW that you'll be done in 1-2 hours. The attitude and energy that you use during practice will NOT be a match for what you'll need on Test Day, so it's not a proper way to practice. All of the 'differences' involved in how you took your CATs could explain why your Verbal Scaled Score dropped on Test Day. You weren't properly prepared for THAT full day, so your score fluctuated.
Thankfully, those are relatively easy issues to fix - and now that you've taken the Official GMAT, you know the EXACT details of what happens on Test Day, so you can better train to mimic those details during your CATs. That having been said, raising a 480 to a 650+ will likely take at least another 3 months of consistent, guided study - and you'll have to make significant improvements to how you handle BOTH the Quant and Verbal sections.
1) When are you planning to apply to Business School?
2) Going forward, how many hours do you think you can consistently study each week?
GMAT assassins aren't born, they're made,
Rich