Have you completed all RCs from OG and Verbal Review?
If yes, then sort RC of GMAT Classic in Gmatclub and practice them.
Verbal part of most unofficial resources is really bad.
GMAT Club tests have shown good effort yet quality of official questions can’t be matched.
I would like to refrain sharing my opinion on top-1-percent because it is not worth sharing on public platform. All I can say is their tests are not aligned with GMAT.
Expert global tests have done some decent work though yet while their quant is very good, DI is harder than GMAT and verbal is slightly misaligned...
If you ask me the. I think Quant 85th percentile seems the area where quick and significant improvement may be achieved in 10 days. Verbal takes it own course to improve.