How to ascertain reversal level in cnx nifty in intraday as well as positional?

Santosh, if you are talking levels, I guess you need to start learning technical analysis. You cannot really ascertain levels just based on market mood, check this out, a great read to get you started on TA. 

I always watch advance and decline shares for market’s mood and global cues or any domestic news that would change market sentiment. I do not have any idea how to ascertain Nifty it all depends upon us peoples reaction to the news or any key level Nifty is at.