Why average students become successful as compare to toppers?

It is not true always ,but in many cases it happens that we consider only those who get good marks in class .But there are various circumstances in which some people perform very well but few can not . For example few students have good family conditions , friends . Let me tell you some very simple story or example from school time ,I used to have 4 friends ,Ajav ,Satish ,Styendra and Suman.Ajay was topper in class ,he always got 1st rank ,Satish was also good he used to get 3rd or 4th rank ,but Satyendra was average ,he used to get 20th or 30th rank in class of 60 students ,Now Suman he was poor student in study ,Suman used to get 50 to 55 rank. So you can understand status of all of these  4 students. After completing 10th, ,they applied in Railway, Ajay got the job but remaining 3 were not selected.Now all of 3 started higher study with science . After 12th with science they applied for job in better post ,and satish got selected but remaining 2 not. Satyendra and Suman continue their study , they started doing btech .after completing Btech, Styendra got Job in some Reputed company ,But they rejected  Suman .Suman Started doing further study .After 1 year of hard work he got scholorship for phd , he completed phd with physics .Finally he become a scienctist in USA. Ajay Railway Job (10th pass,topper)
Satish -Working as clerk in Bank
Satyendra -Software engineer in a CompanySuman-Scientist in USA(Poor during school days in study). What I am writing above is absolutly right , and taken from real example. So it does not mean that you stop focusing on your study .Just you need to understand that , becoming topper in class is not symbol of success in coming future .Once you start getting 1st rank in class you will be under a pressure ,because of many expectation from various member of family , and to maintain the 1st rank you will give your full attention ,so finally you would  not be able to focus on general things. For all students and people , please do not think that no need to study hard and get good rank in class , I only want to tell if some one among you is not getting good marks , please do not judge him for his or her future .