Just tell me...........?

Just tell me frns what is a difference between parveen sharma,parveen jindal....aaditya jain,rajesh makkar........parag gupta,sanjay aggarwal..........as we can see parveen sharma,aaditya jain,sanjay aggarwal is best...but syllabus to har koi pura complete karvata hai...baki in sab ki fee mein difference kyu hai....kya parag gupta knows he is not better than sanjay aggarwal as parag gupta is charging 16000 and sanjay aggarwal is charging 20000...whats the difference between these faculties?