Article snapshot taken from Wikipedia with creative commons attribution-sharealike license.
Give it a read and then ask your questions in the chat.
We can research this topic together.
In the quarter-finals, the match-ups were as follows:
Quarter-final 1: First-placed team in Division One v First-placed team in Division Three (South)
Quarter-final 2: Second-placed team in Division One v First-placed team in Division Three (North)
Quarter-final 3: Third-placed team in Division One v Second-placed team in Division Two
Quarter-final 4: Fourth-placed team in Division One v First-placed team in Division Two
The semi-final match-ups are:
Semi-final 1: Winner Quarter-final 1 v Winner Quarter-final 4
Semi-final 2: Winner Quarter-final 2 v Winner Quarter-final 3
The final match-up is: Winner Semi-final 1 v Winner Semi-final 2.
Promotion and relegation
Division One: bottom 2 teams demoted to Division Two
Division Two: top 2 teams promoted to Division One. Bottom 2 teams demoted to Division Three.
Division Three (North): group winners promoted to Division Two.
Division Three (South): group winners promoted to Division Two.
Separation of teams on equal points
In the event that teams finish on equal points, then a play-off will be used to determine group placings if necessary, i.e. where to decide relegation places or quarter-finalists.