Google Skillshop is Google's own official, free learning platform, with modules and practice mapped directly to the Google Ads Search exam, produced by Google itself. As the official source, alignment with the exam is guaranteed, and the price — free — is hard to beat.
What Google Skillshop doesn't do is track your individual readiness over time. Content is organized in a fixed sequence with end-of-module checks, but there's no diagnostic upfront and no evolving prediction of your pass likelihood as you progress.
Edureify's curriculum is built on the same official material, but the Diagnostic identifies specifically which of Search campaign strategy, bidding, Quality Score, and performance measurement you're weakest on, and the roadmap keeps you there until your Readiness Score improves — which working through official modules in order doesn't measure.