I using lava ivory tab 1 GB ram, 500 mb storage some apps in system storage they can't move to internal memory or SD card that's way my Mobil storage is full how to free some mb in system storage . Which settings I will change...?
Unfortunately there are many phone/tablet models that are unable to move apps to the external storage (memory card). However, what you can do, is to try and remove some of the junk or cache files by using an app for that. Here's an article with a few options: http://www.tomsguide.com/us/android-optimization-apps,review-2445.html
You should also move all of your pictures, music and videos to your memory card.