CertiProf is the certification body behind the SMPC, so its offer is the exam: a $150 voucher that includes two attempts, valid for six months, with an instant score and a digital badge. No course is required, and the official route is self-study from the public 2020 Scrum Guide.
That route keeps costs low, but CertiProf's SMPC page lists no practice tests, diagnostic or readiness tool. You decide on your own when you know the Scrum Guide well enough to clear 32 of 40, and the second attempt is your safety net.
Edureify is not a substitute for the voucher: you still buy the exam from CertiProf. What it adds is a baseline across Scrum theory and values, accountabilities, and events and artifacts, a daily plan aimed at your gaps, and a Readiness Score to time your first attempt.