aarnodorian
It's clear that DI needs work; however, the issue is I feel like I've exhausted all my selected resources. This included OG DI online questions and
Manhattan Prep DI material. Although it is true that I used to get only around 60% of them correct, I'm unsure if I should re-attempt those questions or look for new ones from the GMAT club.
Regarding whether to re-attempt questions done before or to look for new ones, IMHO it depends on why you are getting only 60% accuracy despite your solid Quant and Verbal scores.
If it's mainly because of timing strategy or problem-solving mentality issues, practicing more DI sectionals may help. Alternatively, you can also use
Forum Quiz to construct mixed DI problem sets that simulate a DI section.
If it's because you still have some knowledge/skill gaps in some of the Quant topics more frequently tested in DI, or, say, CR deductive reasoning skills in DS/TPA, then I think the solution will be going back to Quant and Verbal topics to fix these holes.
The Main OG and OG DI Review offer close to 600 DI questions, and there are another 100+ in the Official Practice Question pack. Although the number is much smaller than available Quant or Verbal questions, it is still a decent size, representative question pool. I would think it's more important to figure out where your weakness really lies, instead of keeping on drilling more questions. Remember - quality over quantity.