Is getting certificate at PCEP important?
This is really a matter of opinion, but coding certificates are not widely respected. The problem is that they are generally multiple choice questions and easily crammed for. That is, you can study for a couple of weeks and pass the exams without writing very much code at all. Frankly I've been a Python programmer for well over a decade now and I'd never heard of PCEP. I would much rather see a GitHub repository or contributions to open source projects.

Save your money and spend your time writing more code.