Greetings,
That would be Bhagalpur College of Engineering as per most people.
And if we're talking overall then IIT Patna and NIT Patna would be best.
Here are links to all 3 institutes information pages:
Bhagalpur College:
https://www.careers360.com/colleges/bhagalpur-college-of-engineering-bhagalpur
IIT Patna
https://www.careers360.com/university/indian-institute-of-technology-patna
NIT Patna
https://www.careers360.com/university/national-institute-of-technology-patna
hope it helps,
good luck
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