iOS has always grouped alerts in the Notification Center in the order they were received. If you're overwhelmed with numerous notifications from apps and services on a daily basis, this can quickly clutter your view and push important notifications out of the view.
It is possible to change grouping of push alerts to have them compartmentalized according to their respective originating app and listed in the order you define.
In this tutorial, we'll detail how you can select, manage and adjust app grouping within the Notification Center on your iPhone, iPod touch or iPad.