Another nice plugin added to the Moodle plugins database is “AJAX Question Categories Moving”. This plugin use AJAX to let you move question categories around.
Moving Moodle question categories one step at a time is a long known problem. With this plugin you can move them anywhere in one swift move. I believe that this feature should be included in the Moodle core.
You can download the latest version of the AJAX Question Categories moving plugin from https://moodle.org/plugins/view/local_ajaxcategories The plugin is supported for Moodle 2.8 and 2.9