#violation of procedure

I recently read news about a court decision in Zaporizhzhia which stopped the illegal serving of a summons due to the lack of proper registration. I am interested in whether representatives of the TCC have the right to serve summonses at all without this registration. What are the legal consequences for individuals who were served a summons in violation of the procedure? Can such actions by the TCC be challenged in court?

If I want to become a local court judge, do I have the right to challenge the results of my cognitive ability testing in court if I believe the procedure was conducted improperly?

I learned that a meeting of judges was held at the Commercial Court of Cherkasy Region, where a new chairman and deputy chairman were elected. Can I appeal this decision if I believe that it was made in violation of the procedure?

I am trying to become a judge and would like to know if there is a possibility to appeal the decision of the High Qualification Commission of Judges regarding the admission of candidates to cognitive ability testing if I believe that violations were committed during this process?

If the police stopped my car and suspected me of driving under the influence, but I disagree with the results of the breathalyzer test and believe that the police violated the procedure for conducting it, can I appeal their actions and how can I do this?