I am from patna, Bihar . I only suggest you to choose institute for 12 and IIT JEE according to your ability.
If you are average student then do not waste your money and time on this institute
There are so many instition in patna for IIT- JEE so their is lots of choice. Mentors Eduserv is one of the famous institute in patna but it is not good for average student.
Sometime teachers take long period that makes student upset and bore. In this case teachers try to complete syllabus but students can not concentrate on it.
Overall the teachers were well educated and technique of study is also good but after joining this institute it is very difficult to save time for self studies.
The students who work very hard and also very good in study will join this but if you are average student or not able to work hard on study then this institute is not good for them.
If you miss a single class then it is very difficult to recovery it because your whole day is paas in the institute.