Hi @Kamu,
We definitely understand that a performance-based exam can be intimidating, especially to new SAS users. We want to make our candidates as comfortable as we can, therefore we have created an article to help you know what to expect during your exam: Tips and Strategies for the A00-231 SAS Base Programming Performance-Based Certification Exam
This not only has a lot of great content itself, but it also links to additional videos, webinars, free practice exams.
If you find that the performance-based Specialist level credential is not for you, you could also consider the standard format (multiple choice) Associate level programming credential.