Hello abhishek

hope you are doing great. As per your query  I would glad to tell you that you have done an amazing work as in today worlds identifying fake certificates requires lot of hardwork towards work and you have done after retirement . You should file a FIR against that student so that he/she  can be punished legally but you must carry all the legit proof to prove your point. Morever ,you should inform the cbse headquarters regarding this issue

Hope you found this answer helpful. Good luck for your future