In high school if there was a tie game it got decided at the end of regulation.
Who had the most 1st downs
Who had the most red zone (penetrations)
Who had the most yardage gained
Who had the most offensive plays
Generally the games were decided by first two tiebreakers.
In the 60's we beat a rival two consecutive years in 0 to 0 games by 1st downs & or penetrations