Hello Manish
All coaching centres provide the best as per their norms
Anyway., Following  are some of the best.,in Patna
1.ELITE INSTITUTE
2.Vidhyapeeth academy
3.Aakash institute
4.Study point
5. Brilliant science coaching
6. Paathashaala
Hope it helps you  , thank you

Hi Manish , below are some good coaching classes in Patana for the preparation of IIT,

Super 30 

Akash

Vidhya mandir classes 

Mentors patana

Fiitjee 

I hope it will help.

Thanks.

Hello Manish,
Some of the best coaching institutes are :-
Mentors Eduserv
FITJEE
Resonance
Akash Institute
Parth Ashram...
Hope it Helps.....

Hello Manish Yadav,

Best Coaching Institutes in Patna for IIT - 

• Resonance
• FIITJEE
• Brilliant Tutorials
• Aakash Institute

Thanku.