ISACA, which owns and administers COBIT, publishes the COBIT 2019 framework materials and accredits training partners to deliver official Foundation courses, typically bundled with an exam voucher. Because it's the source of the exam content, alignment with what's tested is guaranteed.
What ISACA's own materials don't provide is individualized, tracked readiness. The framework publications are reference material, and accredited training runs on the provider's schedule with a fixed curriculum, not adapted to your specific comprehension gaps across the five governance domains.
Edureify's curriculum is built on the same COBIT 2019 framework, but the Diagnostic identifies specifically which domain or design factor concept is still unclear, and the roadmap keeps you there until your Readiness Score improves — which reading the framework publications alone doesn't measure.