Pega does not have a CSSA 7.4 Practice exam. We suggest the following study tips for the CSSA 7.4 exam: (1) review the CSSA 7.4 exam blueprint as it will include exam topics and other information about the exam, (2) take and retake the quizzes in the Senior System Architect 7.3/7.4 course until you fully understand the answers - NOTE: Some of the quiz questions are similar to the types of questions you might find on the certification exam, and (3) Review the course exercises until you fully understand them. Our exams are performance/scenario-based, so you really need to know how to use the Pega product. Completing and reviewing the course exercises are a good way to enforce the concepts learned in the course.
I hope this is not a new stance against practice tests for the future. I'll be taking my exam in two days time and was going to run through a practice (I recall taking the 7.2 practice before I ever started the course for 7.3/7.4 as a benchmark). It's very helpful for gauging readiness and weaknesses without reiterating over the entire course contents. The 3 or 4 questions on each section are not a great sample size for really evaluating your understanding but I'll make do. Hopefully future exam-takers will have this tool again.