blitz85
I wrote the GMAT 3 weeks ago and scored 700 (Q 49, V 37). I intend to wrote it again in Oct and want to improve my SC and CR. I have already practised with the OG, 800score practise tests. Can someone suggest the best resources for SC and CR?
Welcome to GMAT Club Blitz85!
I would join in the shadowsjc and pm - you may be better off not working on the app instead of GMAT.
Take a look at the thread PM posted with a link to Tarmac's post (770 and 8 dings) or Pathfinder who studied for a long time to re-take his 720 only to score 690. Retaking success is never guaranteed. GMAT has a standard error of about 40 points, so even if you improve 40 points but don't have as good of a day, you maybe at the same score.
Now that I have scared you

On the other hand, what were your practice scores? If your real GMAT score is out of pattern, meaning you got 760, 770, 780 on your GMAT Preps, then it may make sense or if you used sub-standard materials and now going through Powerscore SC or
MGMAT CR, then maybe... in other words - need a reason why you think you will do better next time. You have one?