Hi,

Arunachal Pradesh Public Service Commission conducts exam in three phases i.e., Prelims, Mains and Interview.

1. Preliminary Examination : It consists of two papers. It is objective type examination. For both the papers the duration is 2 hours each. Paper 1 consists of General studies ( 200 marks ) and paper 2 consists of CSAT ( 200 marks )
2. Mains Examination : The mains exam consists of eight descriptive type papers. Of which two papers are optional papers which candidate has to select from the list given by commission.
3. Personality Test:  For this phase of exam the candidates are selected on the basis of merit obtained in mains examination.

As you have not mentioned, which phase of syllabus you need. Please click on the below links to see the detailed syllabus.

https://appsc.gov.in/upload/files/RECINS001/APPSCCE-NEW-SYLLABI.pdf

https://competition.careers360.com/exams/arunachal-pradesh-public-service-commission

Hope it helps!