Hi. To root the mobicel plum tablet you need the kingoroot apk, click here and download to your phone. Install the kingoroot on your phone. Make sure you enabled installation of unknown source option on your phone by going to settings >security>unknown source.
After installing the kingoroot, run it from the apps. Make sure you data connection is enabled. Now tap the root button and wait until root is successful. If it fail you must try again.