Technically No . But there still some hope left for you if you can contact them now . Give them a legit reason. And then they might allow you to change your date and come to any BITS campus to take the test.

I faced a similar issue when my sister passed away. They told, I can give test on any other date (in accordance with the slot availability), but I've to visit Pilani campus for the same. This happened in 2015 with my friend.

Hope this helps.

You might want to get connected to the exam cell or contact the administrative head of BIT. They might allow you, considering it as a special case, although slots cannot be changed once chosen.

All the best!

Sorry slot booking once done can't be change as that's why they give you time and options to book your slot for the exam according to your own convinience to avoid the chaos later so there is strict no for slot changing by the authorities but if you have a case of an emergency you may contact the authorities to see if they can do something or not they may consider your case if you have a geniune reason but the chances are low.

Good Luck!!