Hey shreya,

First of all let us know whether your application number is getting admission no. of Jadavpur university or any entrance exam. So, if it is for getting admission in jadavpur university then note that they must take your phone no. or any other authorized document during your admission. This will help you to find out your application no. as you have to contact your college and then they will give you your application no. based on your identification proof submitted by you. Same procedure is applied for finding application no. of entrance exams. Hope you find it useful.

Thank you.