Hello Mukesh, hope you are doing great!

I understand that you want to know the dates of 'some' exam in 2021. But there is no mention about any exam. Not even in the tags. So how are we supposed to help you? Your question is incomplete and appears very vague.

Please mention the particular exam of which you want to know the dates. Then only we will be able to help you.

Hope you understood.

Feel free to ask:)