Dear Aspirant 

Yes definitely Indraprastha university will definitely conduct third round of counselling if seats remain vacant even after second round and there is chances that still seats remains vacant, so just wait and watch for third round of counselling to be conducts. 

Good luck for your admission :) 

Feel free to ask if you have any further queries. 

Yes, there will be round 3 this year too. It hasn't been announced yet. So, keep checking this link for any updates on IPU CET about anything. https://engineering.careers360.com/articles/ipu-cet-counselling
 You can also refer to official website.
If you wish to take a drop, do register for CTSE. Link: https://learn.careers360.com/careers360-talent-search-exam?icn=ctse_scholarship_lp&ici=navigation-header_ctse