Way to overburn a CD with Nero

Start Nero
From the action-bar select File and select Preferences.
In the Preferences window, select Expert Features(1) and check the Enable overburn disc-at-once(2).
Choose a Maximum CD Length(3) and click OK(4)

For a more accurate test you can use a nero tool called nero speed test to see how much a specific CD is capable of being overburned . get it here

From the action-bar select File and select Write CD.

A window will appear when you have exceeded expected length, click OK to start the overburn copy.

Remember to set disk to burn Disc at Once, you cannot overburn in Track at Once Mode.