Hello,

The 10th class marksheet or certificate is mainly required in any examination or any admission process for birth date recognising.

But UPSC is the government examination so the marksheet and certificate both are required if there mention it. If it's not mentioned it then you can carry both with you for safe side. And you have to your 12th result and other documents also with you. But if you don't have marksheet then problem occurs because the number also check in your 12th class. You have to collect from board of your 10th marksheet dear.

All the best.