Hi Kiran,
Yes, if you didn't get any seat till 2nd round of aiims nursing then, you can appear for the open round of counselling again.
But in this, your chances of getting a seat is like 50-50% because your sadmission now depends upon the highest cutoff and seat availability during this open round of counselling.
Still I will suggest you to apply for this and hope for the best.
Good luck.
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