Once you tap an item to rotate it, you do not need to keep your finger in the rotate ring. If you move your finger further away from the item you will have more precise control.

You do not need to keep your finger on the screen when rotating, You can lift your finger and "flick" to keep rotating.

If you cannot solve the test, tap the "Learn" button and you will see where the aircraft is.

After you find an aircraft in test mode, it will move into its exact position.