The Preliminary examination for the Indian Forest Service (IFS) is identical to the UPSC IAS Preliminary examination. It comprises two papers, General Studies I (GS I) and Civil Services Aptitude Test (CSAT), both of which are objective in nature.
It’s worth noting that the cutoff score required to qualify for the IFS exam is typically higher than that of the IAS exam, mainly due to the limited number of available vacancies.
For additional information on the UPSC Prelims exam, which is a shared preliminary round for both IFS and Civil Services Examination (CSE), you can refer to the linked article ( Add Hyperlink of PRELIMS UPSC CSE )