Hey student,

Student answer sheet is only valid when you have put right particulars and the invigilator has signed your answer sheet. But if if you have put wrong particulars it will not be valid at it will be really hard to put in results or if the answer sheet isn't signed by invigilator it is not valid you should have put particulars correctly should also be signed by the invigilator.

All the best student,

hope this helps you