MI Sir (Irfat Sir) is the best faculty for Costing in India. But I am not sure about the Pen Drive classes. But in face to face classes, he is definitely the best out of all the faculties that we know in Bangalore and South India.
In his crash course, students from all the institutes in South India come just to get exam ready and the way he teaches in five days of crash course, you will be super excited and get confident about passing.
Many students also repent for attending other faculties since they did not do research and joined without knowing the faculties.
You can contact him on 8147005005/006006.