The BPSC (Bihar Public Service Commission) exam is conducted to recruit candidates for various administrative positions in the state of Bihar, India. The exam syllabus is vast and covers a wide range of subjects. Here is a detailed explanation of the subjects included in the BPSC exam syllabus:

1. Preliminary Exam Subjects:
- General Science
- Current events of national and international importance
- History of India and Bihar
- Geography of India and Bihar
- Indian Polity and Economy
- General Mental Ability

2. Main Exam Subjects:
The main exam consists of two papers, each consisting of several subjects.
Paper I:
- General Hindi
- General Studies - I (Indian Culture, National Freedom Movement, Bihar's Contribution, etc.)
- General Studies - II (Indian Polity, Indian Economy, Geography, etc.)

Paper II:
- Optional Subject 1
- Optional Subject 2

3. Optional Subjects:
Candidates can choose two optional subjects from a list provided by the BPSC. Some of the commonly chosen optional subjects include:
- History
- Geography
- Political Science and International Relations
- Sociology
- Economics
- Public Administration
- Philosophy
- Psychology
- Mathematics
- Physics
- Chemistry
- Botany
- Zoology
- Law
- Commerce and Accountancy
- Statistics

4. Interview:
After qualifying the main exam, candidates are called for an interview. The interview assesses the candidate's personality, knowledge, and suitability for the administrative position.

The BPSC exam syllabus covers a wide range of subjects to test the candidates' knowledge and understanding of various areas. It is important for candidates to thoroughly prepare for each subject to increase their chances of success in the exam.