Winning seven games is 14, which is greater than 13 in the question.
Winning six games is 12 points, 1 flat 1 negative is 1 points, and the total is exactly 13 points.
Winning five games 10, 3 draws, 0 losses and 3 points, totaling 13, which is in line with the proposal.
Winning four games and drawing four games is 12, less than 12.
To sum up, win five or six games.