Since the order leading to decision to revise the questions in the examination for recruitment to the post of PDO was passed by the Karnataka Administrative Tribunal, you’ll have to challenge its decision by filing a writ petition in the Karnataka High Court under Article 226 of the Constitution.
It may be advisable for you to engage some local lawyer in Bangalore, though it is not mandatory and you can file the writ in person also. Obtain a copy of the order of the tribunal, and explain the grounds in detail as to how the revision of the answers was not correct or whatever other grounds you have.
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