Hi, sorry to hear about your bad test day but do not worry, you're seeking help in the right place.
I can see that you have around 22 days to work upon your GMAT, and trust me you can score much more than what you've targeted.
First things first, you need to brush up your basics. for anything above 500, your basics must be clear. If they aren't, go through these links
For quant:
https://gmatclub.com/forum/all-you-need ... l#p1130136https://gmatclub.com/forum/gmat-math-bo ... l#p1073182 For Verbal:
SC:
I would recommend Manhattan SC guide and the following articles
https://gmatclub.com/forum/gmat-math-bo ... l#p1073182https://gmatclub.com/forum/compiled-thu ... l#p1237066for CR,
Go through power score bible, if you don't have one, go through this
https://gmatclub.com/forum/powerscore-c ... 15864.htmlAlso these,
https://gmatclub.com/forum/zomg-the-ban ... 00473.htmlhttps://gmatclub.com/forum/mod-nightbla ... l#p2272709For RC,
I would recommend Manhattan RC guide and a lot of practice. analyse the question patterns
Practice as many official questions as you can and review them thoroughly. spend considerable amount of time on every official question and maintain a
error log. ( go through this
https://gmatclub.com/forum/importance-o ... 68428.html)
That's about it, since you don't have time to chose among the prep courses, GMAT club in itself is a big resource. just keep exploring. Goodluck, crush the GMAT!