Jumping in on the Official Guide and Standard vs Focus questions.
On old OG editions: yes, 2019 and 2022 books are usable. The core question types and concepts haven't changed. The main thing you lose with older editions is a smaller question bank, plus a handful of questions that got replaced. For Problem Solving and Data Sufficiency, the 2019 book is still perfectly solid. Just supplement with GMAT Club's free question banks for variety.
Manhattan books work the same way. Their strategy content is largely format-agnostic, so the older editions are fine for learning concepts. I actually used a 2019 Manhattan Quant book during my prep and it covered everything I needed.
On Standard vs GMAT Focus Edition: these are genuinely different tests. Standard GMAT had Verbal (Sentence Correction, Critical Reasoning, Reading Comprehension) + Quant (PS + DS) + Integrated Reasoning + AWA. GMAT Focus Edition scraps Sentence Correction entirely, adds Data Insights (which combines IR-style questions with DS), and cuts AWA. The scoring scale also changed, so scores aren't directly comparable. If you're prepping now, you're prepping for GMAT Focus Edition, so make sure your materials are current.
On subscriptions: TTP is very strong for Quant if you're building from scratch. e-GMAT's verbal methodology works well for non-native speakers. For DI specifically, GMAT Club's own tests are underrated and free.
Good luck to everyone in the group!
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