He scored 4*6=<<4*6=24>>24 points per game
So he scored 15*24=<<15*24=360>>360 points from touchdowns
He also scored 2*6=<<2*6=12>>12 points from the 2 point conversions
So he scored a total of 360+12=<<360+12=372>>372 points
That means he beat the old record by 372-300=<<372-300=72>>72 points
#### 72