@CHOBBARSAAB I would like to add some more points.
If the company is not good then there might be lower circuits for days and you cannot exit easily.
If the operators decide to move the stock around then we cannot do anything about it.
If the markets are volatile then again no one can say anything.
So, if you really want to exit, then exit in pre open on listing day. Here also you might not get the price you want but you will be able to exit..
If you take note of this then you should be able to sell SME on listing day..