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Hi Madhavi,
Android version is OK but I think your Iball tablet is having a hard time as it only has 512 MB of RAM.
Please check how many programs you have running simultaneously with loading Candy Crush Saga. You can do so by going to Settings >> Apps >> Running apps. Here you'll also find an overview of available RAM
I suggest you reboot the tablet then close any app that automatically starts up followed by starting Candy Crush Saga.
I hope you get the game to work smoothly on your tablet :-)
Mark, Team King Care