How many times a year do Huai’an public institutions recruit?

Once.

Jiangsu public institutions take the exam once a year. Announcements will be released one after another in March 2021, and the written examination will be organized by the provincial open recruitment comprehensive management department. The names of the written examination subjects for science positions, general professional and technical positions, and work skills positions are all "Comprehensive Knowledge and Ability Qualities", but the examination content is different.