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Teachers interested in accepting this challenge will need certification as a high school teacher in Taiwan and a TOFFEL score above 213.

Hi,

Is it right to replace "certification" in the above with "a certificate?" Thanks.
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Only if you rearrange things a bit

..will need a high school teacher certificate...
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certification may or may not be equivalent with just having a certificate, it could be more than that
certification: action to certify that someone satisfy some requirements
Students: We have free audio pronunciation exercises.
Comments  
Thanks, Nona.

By the way, does "a certicate of a high school teacher" do the trick?
No, not really.
Students: Are you brave enough to let our tutors analyse your pronunciation?
 Marius Hancu's reply was promoted to an answer.