If the Chinese score is X, the math score is (X+6);

If the average score of the other two courses is 86, then the total score of these two courses is 86*2= 172 (points);

Because the total average score is 9 1,

So x+x+6+172 = 91* 4;

So x=93 (minutes)

So 93 points for Chinese and 99 points for math.