Dear Purushotam,
BPSC- Bihar Public Service Commission is a body created by the Constitution of India to select applicants for civil service jobs in the Indian state of Bihar according to the merits of the applicants and the rules of reservation.
In order to prepare for this exam you should be aware of the complete syllabus of the exam.
Your concepts for the subjects should be clear and your fundamentals should be strong.
You should be updated with your general knowledge. Read newspapers daily. You can also read Pratiyogita Darpan.
Good luck!!
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