ISTQB, which owns and administers ISTQB CTFL, publishes its official syllabus for free, along with sample exam questions, covering testing fundamentals, test process, test techniques, and test management. Local ISTQB member boards also accredit third-party training providers. As the source of the exam itself, the free syllabus is fully authoritative.
What the free syllabus doesn't provide is individualized readiness tracking — it's a reference document you read and reread, with sample questions as your only self-check, not an adaptive system predicting your pass likelihood.
Edureify's curriculum is built on the same official ISTQB syllabus, but the Diagnostic identifies specifically which of testing fundamentals, test process, test techniques, and test management is still unclear, and the roadmap keeps you there until your Readiness Score improves.