Seven pairs of basketball games. . What is the most suitable plan?

Our department is also the first in seven classes. The advantage of periodic elimination of points system is that each team has the opportunity to face the shortcomings for too long.

The second draw, three teams in a group, one team bye, has the advantage of saving time and the disadvantage of being accidental.

Third, through past achievements, the first place to the seventh place is the middle reaches team bye in turn.