The general rule is that all the required exams for a certification must be passed at the same release level.
The exception is that if one already is a Teradata Certified Master at V2R5 level, passing a single Qualifying Exam will permit taking the TD12 Comprehensive Mastery exam. In that case only, it is not necessary to repeat all the individual exams at TD12 level.
Note that the V2R5 exams have been retired for quite some time now.
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