Laurence, this probably doesn't make sense, but I think you should focus on verbal. It's easier to improve in what you do worst.
For example, it's easier to improve when you get 2 correct answers out of 10, compared to when you are get 9 out of 10. To improve that extra 10% wil take longer than to improve, let's say, 40% (in the first scenario).
So I would concentrate on verbal (without overlooking quant). Go through your preps, books, anything you have answered and see what are your weaknesses. Be honest with yourself.
When you know what's going on, seek help for those specific areas to get the right material. I would strongly advice to do it fast (Maybe needless to say).
In my case, SC is/was the worst out of all 5 things tested. It took me 5 days to fully memorize everything in the MGMAT SC
(except for idioms, which I rather do slowly).
It would also help to know how much time you are studying a day. What materials you have.
If I were you. I would also see if there's any chance I could delay the test. The more time you have, the better. That would ease some of the stress you are feeling right now.
Finally, keep it up. Worst thing you can do is let GMAT beat you. You'll do it! Just committ to it.
I hope this helps and let us know how you do. There's a lot of people out here you know the GMAT inside and out.