विज्ञानं के अतिमहत्वपूर्ण सवाल Most Important Questions of Science , Devendra sir .
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This is the best class of GS . GK for any exam like SSC,BSF ,RAILWAY,POLICE,NDA ETC
We are explanning all the questions of previous years, which have asked in several exams . This session will cover all the important querries