Answer:
Certification means official 'verification', 'confirmation' or 'attestation'.
Step-by-step explanation:
In the given passage, the speaker talks about how 'would-be' teachers have to go through a process. This process, called "certification" is required so that "a background check" can be done, and then they have to "take a certification test, and earn student teaching hours".
This "certification" implies the documentation, verification, or confirming the 'educational qualification' of that person. It is the process of legally or officially confirming the person is eligible for the teaching job.
Thus, "certification" in the passage means the official verification, authentication, confirmation, or attestation of that person's background.