Dear Bhupen, it is important to have a running hand signature. Say if you are a right handed person and you uploaded a scanned image of your left hand signature, NTA will not know it and your application will be accepted. But during the exam, the invigilators will ask you to sign the attendance form, because you are a right handed person, you automatically sign with your right hand. And when the signatures do not match, you might not be even allowed to attempt the exam. The rules are set for a reason and it is in your best interest that you are advised to follow them.