Hi Shrug,
Had you taken any mockups before the real thing? If so, how had those turned out? I think it'll be much faster to improve in verbal than to improve in quant. The lower the score, the easier I find it to be improved, but of course this is a very personal consideration that many people may not share.
VerbalDo you know what type of questions you struggle the most with? I've always found SC to be the easiest verbal part to improve, and it can have a very significant effect on your score. Have you used the Manhattan SC Strategy Guide? To me this is the most useful of the Manhattan strategy guide. Just working with it for a week and only working on SC (no CR and no RC yet), I was able to boost my baseline V28 score to V32~V36 in the subsequent mockups.
For CR, the PowerScore Bible has worked quite well for me. For verbal, I thoroughly recommend working only with OG exercises, while studying the concepts, as the phrasing of other sources can be quite different from that of the GMAT.
I have been reading lately great things about e-Gmat's verbal content for non-native speakers, but I haven't checked it myself. You can check it out:
https://e-gmat.com/QuantFor Quant I'm afraid I can't help you as much, as I'm in the same place you are. I've been stuck at Q48 for a few weeks, and I'm trying to make it up to Q50 or Q51. I'm going through Bunuel's topics, the hard questions, tricky & tough, etc. It seems like it's helping so far...
Hope I've been able to help!
Cheers,
paula