GMAT on 24 OCT

seems like you are just trying to do as many problems as you can. Analyze which topics are your weakest, and read up on it. Do many problems geared at your weak areas, and then resume taking practice exams up until Oct. 24th. Good luck!

I do analyze my weak points and i am trying to not to repeat the same.
CR and RC are good only thing i lack is in SC .. so i am taking as many problems regarding SC as possible.

Quant area is not so bad however DS is my weak link in MAth section.
How should i go ahead as in take exams or go for a particular section

Perhaps you should get your hands on the Manhattan GMAT Sentence Correction book, and review the uploaded documents on this site for sentence correction (i.e - Spidey's notes).

For DS problems, I usually take the plug and chug method for most math problems (use actual numbers and try to disprove the statements). I highly recommend you go over every single DS problem you get wrong, and perhaps make a note on what trapped you. That may help you remember the little tricks GMAT uses.

I will surely try to do MANHATTAN SC .
For DS apart from OG11 and OG 12 what else should i try my hands on.