I took and passed both of these exams three or four years ago and purchased the following "sample exams" as part of my study effort. Neither of these publications are based on actual past problems but when coupled with a rigorous review of surveying and seismic principles, they should give you some confidence headed into the exam.
"Civil Surveying Sample Exams for the California Special Civil Engineer Examination", second edition, by Peter R. Boniface, Ph.D., PLS
"Seismic Principles Practice Exams for the California Special Civil Engineer Examination", third edition, by Majid Baradar, P.E.
Good luck!