You did not mention for which particular post you want to apply in Bihar Public Service Commission for that I will get details for you.

To apply for post follow the procedure

Drive to official site of Bihar Public Service Commission which looks like this

Bihar Public Service Commission



Home page will open look for notification
Which is the middle of page there you can get information easily

At present I have this latest information issued by them
Important Notice: Regarding Admit Cards and its download procedure for 56-59th Common Combined (Main) Written Competitive Examination.
Examination Program: For 29th Bihar Judicial Services (Preliminary) Competitive Examination. (Advt. No. 01/2016)
Examination Program: For the post of Lecturer of Civil Engineering/Technology in Govt. Polytechnic/Govt. Women Polytechnic Colleges. (Advt. No. 36/2014)
Examination Program: For the post of Lecturer of Mechanical Engineering/Technology in Govt. Polytechnic/Govt. Women Polytechnic Colleges. (Advt. No. 35/2014)
Examination Program: For the post of Lecturer of Electrical Engineering/Technology in Govt. Polytechnic/Govt. Women Polytechnic Colleges. (Advt. No. 34/2014)
Interview Letters: For the post of Assistant Professor (Chemistry) in various universities. (Advt. 66/2014)
Important Notice: Invitation of Objections to Answers (by Question Setters) of Assistant Conservator of Forest (Written) Competitive Examination. (Advt. No. 85/2014)
Answer Key (by QS) :: General Knowledge :: Forestry & Environment :: Booklet Series A, B, C, D.
Important Notice: For the post of Lecturer in Govt. Training Colleges. (Advt. No. 02-04/2016 & 06-08/2016)
Examination Program: For 56th-59th Common Combined Main (Written) Examination.
Important Notice: For the post of Sr. Scientific Officer, Photo Branch, Physics Division with Home (Police) Dept. (Advt. No. 08/2015)
List of Eligible & Provisionally Eligible Candidates Ineligible Candidates Candidates Selected for Interview.
Important Notice: For the post of Lecturer in Electrical Engineering/Technology in Govt. Polytechnics/Govt. Women's Polytechnic Colleges. (Advt. No. 34/2014)
Eligible/Ineligible/Provisionally Eligible Candidates Advt. 34/2014
Interview Program: For the post of Assistant Professor (Chemistry) in Universities and its constituent Colleges. (Advt. No. 66/2014)
Eligible/Ineligible/Provisionally Eligible Candidates Advt. 66/2014
Important Notice: Invitation of Objections to Answers to the exam for Lecturer in Govt. Polytechnics. (Advt. No. 33/2014)
Answer Key (by QS) :: Electronics Engineering/Technology :: Booklet Series A, B, C, D.
Important Notice: List of additional provisionally eligible candidates for interview of Assistant Professor (Mathematics) in various universities. (Advt. No. 70/2014)
Corrigendum: For the post of Lecturer, Art & Craft in Govt. Training Colleges. (Advt. No. 04/2016)
Interview Program: For the Post of Assistant Professor (CE, E&EE, ME, CE/C.Sc., Physics, English, Geology, Chemistry) in Govt. Engg. Colleges under Dept. of Science & Technology. (Advt. No. 20-23 & 25-28/2014)

Address:-
Bihar Public Service Commission
15, Jawahar Lal Nehru Marg, Bailey Road, Patna, Bihar 800001

Phone:-
095768 95386