In last accountancy exam due to mismanagement of time i had left questions of 20marks and I want to appear for improvement examination.Am I eligible to appear in this and what are its condition.plz tell me..

Ankita, I believe that you are talking about the accountancy exam held on March 17, 2016. For this please do not worry and wait for the results. Ideally, at this point of time you should focus on the preparation of your next exam and make sure to finish the paper on time.

However, if you still want to appear for the improvement examination, then conditions are specified on CBSE website. You can go through the following link.
http://www.cbse.nic.in/examin~1/scheme06ex.htm