I will share my experience even though it was bad so may be more useful-
1. I enrolled with manya Princeton review but I have extremely bad experience. I am still not aware with many things relevant to gmat..I read about scoring pattern in this group.
2. Plan well before attempting, planning is not a bad thing and GMAT specially requires planning as I was working and treated like other exams so I badly failed in verbal even though scored good in quant.
3. Never believe everything shared on youtube, verbal and RC I faced was quite different and so I found reading quick and accurate are key trick so read articles and a good newspaper on daily basis for RC..Nothing else will work..try practice test as much as you can.
I will be attempting again in July so kindly make a group for june july where we can have discussion