I have gone through various study plans on this forum and consolidated all the resources into one 'ultimate hardcore advanced' verbal study plan.
OG 13
OG 12
OG 11
OG Verbal
MGMAT SC
MGMAT RC
MGMAT CR
PowerScore CR Bible
Powerscore GMAT Verbal Bible
Kaplan GMAT Verbal Workbook
Kaplan GMAT Verbal Foundations
Powerscore SC
Powerscore LSAT RC
Powerscore LSAT CR
Gayathri's SC notes
gauss' grammar notes
Gin's RC notes
Spidey's SC Notes
Sahil's notes
Aristotle SC Grail
doing grammar - max morenberg
GMATClub Verbal Grammar Book
Manhattan Verbal Foundations
Slingfox SC/RC/CR Notes
Whiplash CR guide
This might seem like overkill, but this is what I'm doing. Consider this if you have 2-3 months off and take your best shot at the GMAT.
Consider giving kudos if this post helped!
Regards
MK