8. The total score of an exam consists of six 6-point questions, six 9-point questions, and twelve 5-point questions. Therefore, the number of different scores that can be formed by this test paper is $\qquad$
8. 136.

Since there are scores, and the scores can only be generated from the 150 positive integers from $1 \sim 150$, and the sum of the scores and the deducted points is also 150, we only need to consider the number of positive integers from $1 \sim 75$ that can be represented by $6x + 9y + 5z$ (where $x, y, z$ are integers, not all zero, and $0 \leqslant x \leqslant 6, 0 \leqslant y \leqslant 6, 0 \leqslant z \leqslant 12$). Clearly, the numbers $1, 2, 3, 4, 7, 8, 13$ do not meet the conditions.
Notice that
$$
\begin{array}{l}
\text { (1) } 14=5+9, 19=2 \times 5+9, \cdots \cdots \\
69=12 \times 5+9, 74=4 \times 6+10 \times 5 ; \\
\text { (2) } 15=6+9, 20=6+9+5, \cdots \cdots \\
75=6+9+12 \times 5 \text {; }
\end{array}
$$
$$
\begin{array}{l}
\text { (3) } 16=6+2 \times 5, 21=6+3 \times 5, \cdots \cdots \\
66=6+12 \times 5, 71=2 \times 6+9+10 \times 5 ; \\
\text { (4) } 17=2 \times 6+5, 22=2 \times 6+2 \times 5, \\
\cdots \cdots 72=2 \times 6+12 \times 5 ; \\
\text { (5) } 18=2 \times 9, 23=2 \times 9+5, \cdots \cdots \\
73=2 \times 9+11 \times 5 .
\end{array}
$$

And 5, 6, 9, 10, 11, 12 also meet the conditions. Therefore, there are 68 numbers that meet the conditions in the range 1 to 75. Correspondingly, there are 67 numbers that meet the conditions in the range 76 to 149, plus 150. Hence, the total number of positive integers that meet the conditions is 136, meaning the test paper can form 136 different score combinations.