Hello Bhargavi,
yeah, your allotted seat in the first round will be retained to you only, if you didn't get any seat in the second round. I f you want to know more information about the CSAB special round then you have to check the official website of it. here is the link.
Https://csab.nic.in/cms/Public/Home.aspx
Once you can go through this link and check the business rules. hope it helps you.
Thank you.
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