GPSC State Tax Inspector (STI) Call Letter Download (Advt. No. 28/2024-25). Get ready to download your GPSC State Tax Inspector (STI) Call Letter for Advt. No. 28/2024-25.The Gujarat Public Service Commission (GPSC) has released the admit card for the State Tax Inspector exam.Candidates can download their admit card from the link given below. Admit card is the only document required to appear in the exam hall. This admit card contains important details of the candidate and information about the date and venue of the exam. For more information, see the post below.