Hello,
You need to have the following documents with you at the exam centre for JEE Main 2021:
Your study conduct certificate is not a valid Photo ID proof. You can use any of these passport, college/school ID card, driving license.
Also from a previous question you have asked you have mentioned that you have applied for the correction in Adhaar card, so you can take it with you to the exam centre along with the slip as a proof. But it would be best to carry any of the above mentioned ID proof.
Good Luck
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