Hi Anupama,
The recently released JEE-Mains notification clearly mentions that the candidate should have passed the 12th or equivalent examination. If your overall result is Pass, you can definitely answer Mains-2. However, I would suggest you to wait for your improvement paper results to avoid any complications.
However, you will not be eligible for admission in IIT or NIT as they require a minimum cutoff of 75%.
Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile