Which RC ressource if OG's are exhausted?

Hello, chrtpmdr. I assume you mean you have exhausted the RC questions of whichever OG you have gotten your hands on. If so, have you done the questions from the Verbal Review? Why not take a look at the new OG Directory and find questions you have not done from past editions or publications? Here is the link:

https://gmatclub.com/forum/gmac-official-guides-the-master-directory-240610.html?fl=menu

I agree with you that any other source of RC questions is a pale comparison at best. I tell all my students to use third-party material--Manhattan Prep, Veritas Prep, and so on--sparingly, always centering their studies on official questions. Since GMAC™ does not license its questions for others to use, and since copying official questions and tweaking a word or two constitutes a copyright violation, these outside questions (and passages, for that matter) always have a slightly different feel to them. Getting used to another system can prove detrimental to your performance if you cannot appreciate the differences. Again, always center your studies on official questions.

If you have exhausted all the old and new official passages, then I would suggest that you go back and reexamine your errors, working to understand what makes all the incorrect responses incorrect. You can prove yourself on new material during the day of the test. (I suspect you find something in that directory, though. Maybe you should savor one passage in a day rather than hold yourself to a four-a-day pace. The GMAT™ is a test of reasoning, and if you think going through passage after passage is necessarily going to make you a strong test-taker, then you are mistaken.)

Good luck with your search.

- Andrew