Hey siddhartha!
I also applied for IIT JAM last year and my signature and photographs were not of the desired size and I was also confused like you but don't worry after some days i. E.after the application for the form will close if there will be any error in your photograph or Signature they will notify you with a mail and they will give you a  deadline to rectify those mistakes .If you will be unable to rectify those mistakes even till the deadline then your application will be rejected but please try to to fill the correct form only at the first time. .
Best regards!

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