1. If you have a strong PowerCenter knowledge, you don't need the developer Level 1 & 2 course. I was in the same Situation - after internal trainings and a lot of PowerCenter projects, i choosed not to do the trainings.
3. You should scan about all Topics, there a a lot of different questions in the certification.I think the Web Services Guide can pobably skipped. In the PowerCenter Installation and Config Guide, you should read the architecture topic. In my opinion, the topics like caching and parameter&variables are not easy, you should have a deep knowledge about this.
Thank you Markus for the response. I have started studying and will reach out to you if I have further questions.
I am planning to go for "PowerCenter DI Developer specialist certification". I think you would have completed this training. As mentioned by Markus, can I skip the developer Level 1 & 2 courses?. Can you please provide more information on it.
Thanks in advance.