It cannot be done, some exchanges take the time to ask their customers what coin they want to see being traded on their platform and if the coin wins a poll then there is a chance that coin will be added next, however there are many requirements for a coin to be traded in an exchange especially if it is one that has a good reputation, after all the exchanges do not want to put any coin into their platform and then see the developers of the coin scamming their customers.

So probably the only reliable indicator that we have to know if whether or not a coin is going to be added to an exchange is if the coin and the developers are any good, if they are not then don't waste your time, if they are then they could eventually make their way to an exchange but this could take years.