Hello Pinki,

Following are the list of colleges which are best in civil engineering in Bihar, 

IIT PATNA,

NIT PATNA

AMITY UNIVERSITY PATNA

MAULANA AZAD COLLEGE OF ENGINEERING AND TECHNOLOGY.

RP SHARMA INSTITUTE OF TECHNOLOGY PATNA

BIRLA INSTITUTE OF TECHNOLOGY IN PATNA

ARYABHATTA KNOWLEDGE UNIVERSITY PATNA

MUZAFFARPUR INSTITUTE OF TECHNOLOGY

BHAGALPUR COLLEGE OF ENGINEERING

HOPE THIS HELPS !!