The Himachal Pradesh Public Service Commission conducts the HAS exam annually to fill various administrative posts in the state government. The exam consists of three stages - a preliminary exam with two objective papers, a main exam with written papers and an optional subject, and a viva voce interview. This document provides details on the exam pattern, syllabus, centers, important dates, eligibility criteria and age limits. The number of vacancies for posts like HPAS, Tehsildar, BDO and Assistant Registrar are also mentioned.