Coming back after years is actually a decent position, you already have the quant instincts, you just need to redirect them. Big structural changes: Focus is shorter (2 hours 15 vs over 3), no AWA essay, and IR doesn't exist anymore as its own thing, it got folded into a new section called Data Insights (DI) which now counts toward your main score, basically IR's ideas plus Data Sufficiency merged together. Quant dropped Geometry as a heavily tested area (still shows up occasionally, just less), and yeah, Verbal cut Sentence Correction entirely, so it's just Critical Reasoning and Reading Comp now. You also get to bookmark and change up to 3 answers per section, which classic GMAT never let you do. Honestly I'd spend the most fresh study time on DI since it didn't exist in your old prep at all. Mba.com has an official "GMAT Focus vs Classic" comparison page worth a look too.