GMAT Strategy

My exam date is 22nd October, which is 17 days from now. I know i am way too behind my schedule and i had expected to complete OG'13, Kaplan premier, Manhattan strategy guides by now. But i have managed to complete only the manhattan strategy guides(4th edition) and the corresponding quants questions from OG'12. I have completed Manhattan SC. Still i am facing problem with SC. From OG'13 I did starting 40 questions, getting around 8 right out of 10. After that from question 40-70 i have got 5 right out of 10. and this has become constant. if i do 10 questions i HAVE to get 5 wrong. dnt know how to proceed now with SC. CR i did from powerscore, it improved my CR a lot. RC i am following strategy from Ron's video. DS is currently my weakest topic. I have to practise more.

My scores:
1.Manhattan CAT 1: 470 (without any study)
2.Manhattan CAT 2: 500 (studied but very less)
3.Kaplan CAT 1: 570 (i had studied this time, though did bad in rc and cr)

Please suggest me what should i do to improve in SC and DS and do you think there is a scope of somewhat improvement by 22nd October..
Also, my judging based on that i am doing 5/10 right and 8/10 right. is it correct? or should i maintain the error logs and treat every question differently. Please help..

200 point improvement in 3 weeks is very hard. I would blatantly say, its impossible unless of course your practice tests are skewed in some way. This is not to discourage you, but do not waste an attempt knowing that you won't make it - as simple as that. Take a GMAT Prep mock with 8 min breaks and AWA IR immediately. Anything less than 680, you probably need to reschedule your test. GMAT Prep is the most accurate indicator of how much you will score on your actual test, so don't give too much importance to other test prep mock scores.

Check these links.

https://www.beatthegmat.com/is-it-missio ... 24055.html
https://www.beatthegmat.com/gmat-strateg ... 23818.html

thanks sam. even i feel i should postpone the test till november.

Thanks a lot Brent.