The new GMAT F is just a rebranding of the classic exam with a new cloth
All the concepts for the classic GMAT are good for the new GF
As a matter of fact, even the website Businessbecause
https://www.businessbecause.com/news/gm ... prep-books suggests for the quant concepts to prepare the old but still great book by Jeff Sackmann - Total GMAT Math
DI is just DS+IR. Therefore, the old IR by Manhattan is still valid and perfect for understanding the theory of the four types of questions during the DI section
Quant section is still also the same but the geometry
Verbal section is still the same with RC and CR with the caveat that the RC are no longer passages with 7 questions but at most, I believe, four questions
Turns out, the Gmat Club math book is still relevant to prepare for the quant section for FREE.
Conclusion: study the theory for every section and practice a lot on GC, Use our great
error log or our quant and verbal quiz. That's it
My humble opinion