Hi viky, if you have low paging success, first check the Paging congestion hour by hour and how the load is shared in the diferents LA, if there are no problems may be your system need a Paging channel redimensioning or new LA partitioning.
Check if the system sends a second paging message and the percentage of success (2nd Paging Success).
Let me know your statistical results in order to find a way to help you to resolve the problem.
What vendor is your system?