If I take admission in the very first batch of IIIT Una (cs), Himachal Pradesh, will I surely be placed? What is the best placement story of someone who got placed from the first batch of IIIT/NIT?

There is no surety that you will be placed in a good company. It only depends upon your capability and your hard work. You will have to look for the companies and talk to the placement department as well. 

If you are only concerned about placements then you should opt for IIIT Guwahati. This institute offers a rich coding environment. Their first-year students won a robotics competition organized by IIIT Guwahati. The faculty members of this institute are supportive and they will encourage you to participate in various competitions.

IIIT Una is a new institute when compared to other institutes. However, if you have started competitive coding, then it’s a plus point. To ace the placements, you must become the best in coding.