หลายๆคนมีข้อสงสัย คิดกันยังไง ลองมาดูกฏในเอกสารของ afc กันครับ
ที่มา http://www.the-afc.com/uploads/afc/files/afc_U-23_championship_2016_regulations.pdf

16. Technical Rules of the Competition
a) In groups composed of several teams, three (3) points shall be awarded for a win,
one (1) point for a draw and zero (0) point for a loss
b) The ranking in each group shall be determined as follows:
    i. Greater number of points obtained in all group Matches;
    ii. If two or more Teams are equal on the basis of the above criterion,
their places shall be determined, in the given order, as follows:
        A) Greater number of points obtained in the Group Matches among
the Teams concerned;
        B) Greater goal difference resulting from the Group Matches among
the Teams concerned (if more than two teams finish on equal
points);
        C) Greater number of goals scored in the Group Matches among the
Teams concerned (if more than two teams finish equal on points);
        D) If, after applying above criteria to several teams, two or more
teams still have an equal ranking, the above criteria shall be
reapplied, in the order given, to determine the ranking of these
teams. If this procedure does not lead to a decision, below criteria
shall apply
        E) Greater goal difference in all the Group Matches;
        F) Greater number of goals scored in all the Group Matches;
        G) Kicks from the penalty mark (if only two Teams are involved and
they are both on the field of play);
        H) Fewer score calculated according to the number of yellow and red
cards received in the Group Matches (please see Appendix 1);
        I) Drawing of lots.