Companies must meet Google's Partner requirements (performance, spend and certifications) and rank in the top three percent of participating companies in their country. Google re-assesses the status every calendar year. WeAdU has re-qualified in 2024, 2025 and 2026.
That's how our FAQ puts it.
Our Google Premier Partner page lists the same years and explains what the badge means for the accounts we manage. To check the badge yourself, see How to verify WeAdU.
Choosing an agency is a separate question. It's covered in Should an ecommerce reseller pick a Google Premier Partner agency?.