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There definitely is a correlation and I, sadly, can confirm this on my own. Before my first GMAT attempt in Dec '12, I had the exact same question and contacted many "720+ debriefers". In fact, almost all had an OG12
/OG13accuracy of 90%+ in all sections. Here I am talking just about the hit rate of their first completion of official questions. Personally, I had a success rate on OG questions about 80% (between 75% in PS and DS and approx. 90% in RC and CR) and ended up wth a score of 640. So I do think that you should try to work on your weak areas.
Provided you have already had an in-depth look at all mistaken/guessed questions, the very best approach for you here should be to take one official GMATPrep test. I think this will show you where exactly you stand in terms of Verbal and Quant. If you are already around V42, I would concentrate on Quant. A 82-84% hit rate on Quant could result in a Q45, which still offers a lot of improvement. You have to have in mind that a Q45 is somehow low in terms of its overall percentile rank.
But as I said - it is very important to first understand WHY you did the mistakes/guesses, find every possible way of solving the mistaken questions and of eliminating all wrong question answers!
Good luck! Keep us posted!
Thank you very much for reading this post till the end! Kudos?