Can you directly take the senior technician certificate (Q&A): The senior technician certificate can only be obtained by passing relevant exams, and usually requires candidates to have a certain skill level and work experience. The content and difficulty of the Advanced Technician Certificate Examination vary from country to country. Generally speaking, the advanced technician certificate examination consists of two parts: a theoretical test and a practical test, and only if you pass both parts can you get a certificate. For details of the specific registration exam, please refer to the nod picture
If you want to directly obtain a senior technician certificate, you may need to meet certain conditions first, such as having an intermediate technician certificate, having certain skills and work experience, etc. In addition, it is important to understand the local testing policies and requirements in order to prepare for the exam in a targeted manner. 
Don't be discouraged if you don't have the opportunity to get a senior mechanic certificate directly. You can improve your skills through continuous learning and practice, accumulate more work experience, and lay a solid foundation for future career development. At the same time, you can also consider taking the intermediate technician certificate first, and then gradually move towards the senior technician certificate. 
In short, you need to have certain conditions and preparation to directly obtain a senior technician certificate, but as long as you have enough strength and preparation, I believe you will be able to obtain this vocational qualification certificate.