Allen Institute is one of the best coaching institute in India which provides good enough education quality to crack any competitive exam. I was also a member of this institute in 2008 and now I am going to be a doctor. Not MBBS but PhD ??. The biggest drawback of this institution is it's large number of students in every classroom. Sometimes we even don't have a place to sit. Allen must have to consider this problem and lower the batch sizes to provide better education to their students.
Although the teachers of Allen coaching are very very good. They can handle even this huge number of students very easily and does not let their students getting bored. I always recommend Allen Institute to all my juniors and family members.