With iOS 9, you have the option to sort pull-down notifications. This allows you to group or ungroup apps and view notifications sorted manually or by most recent. When you group apps, they’re sorted into blocks under notifications with the most recent app appearing at the top. When apps are ungrouped, notifications will sort intermixed by most recent unless sorted manually.
Group or Ungroup
To group or ungroup apps, open Settings. Tap Notifications.
Turn Group By App off.
Recent or Manual
Notifications are automatically sorted by most recent; however, you can manually sort which apps appear as well. To change the order in which app notifications appear, again, visit Settings and tap Notifications. Select Sort Order.
Within Sort Order, check Manual. Then drag and drop your applications in the order you’d like them to appear. To drag, place your finger on the handle icon next to each app. Apps located at the top of the list will take priority.