First, Don’t take GMAT Online, if you’re thinking of doing MBA from ISB, other A MBA colleges in India. They don’t consider ONLINE GMAT Score.
Secondly, I can understand the distraction you faced because of the other candidates appearing for some other exams. Did the exam center give you headphones? If Yes, weren’t they effective?
Synthesis from your Mocks, you think you’re weak with Verbal. Yes, relatively to Quant. But since you were more consistent with DI and Verbal, you can think of changing orders. Try the experiment only in Mocks. Then follow a specific order that helps you have better score. Quant you have the potential to hit perfect score again. Just see, if you will be in your best state to handle Quant after Verbal and DI.