Hello,
I work with the SAS Certification Team and I can tell you that the practice exam for the BASE Programming Specialist is very much like the types of questions that you will see on the actual exam. The exam covers the same topics and is at a similar difficulty level as the live exam. Taking it is a good way to practice and study for the exam.
Another resource you might check out is our webinar about preparing for the BASE Programming Specialist exam: https://www.sas.com/en_us/webinars/prepare-for-the-sas-programming-specialist-exam.html
I hope this helps.
Best of luck to you on the exam.
Kindest regards,
Becky Gray