This has been my subjective point of view. Can someone strengthen my argument with their experience?
I realized it the moment when I was only doing the OG problems on GMATClub, I rarely got one wrong and even the ones rated as 'hard' are quite solvable.
A few days ago I also started implementing the OG more (doing PS drills - 20 problems in a row under time constraint) and my hypothesis got confirmed again. Rarely do I come across a problem that goes beyond my thinking capabilities.
Now when I flip over to ALL the GMATclub problems the struggle usually start's - no matter the rating of the answers it is often the case that getting the right answer envolves some kind of struggle. I sometimes feel like the authors want to push each other to see who writes more "encrypted" problems.
The non OG rated hard ones are usually totally out of my scope, like not even a slight chance I would solve them on a test day. (Remember the hard rated OG ones come quite smoothly)
Anyone else who noticed that? Or is it really just my subjective bias.
I was quite astonished when I went from "only gmatclub problems" to OG problems.
And I don't want to disregard GMATclub - I love it, I actually think me only doing the problems on their strengthened me a lot.