At the Mountain School, Micchell is assigned a [i]submissiveness rating[/i] of $3.0$ or $4.0$ for each class he takes. His [i]college potential[/i] is then defined as the average of his submissiveness ratings over all classes taken. After taking 40 classes, Micchell has a college potential of $3.975$. Unfortunately, he needs a college potential of at least $3.995$ to get into the [url=http://en.wikipedia.org/wiki/Accepted#Plot]South Harmon Institute of Technology[/url].    Otherwise, he becomes a rock. Assuming he receives a submissiveness rating of $4.0$ in every class he takes from now on, how many more classes does he need to take in order to get into the South Harmon Institute of Technology?

[i]Victor Wang[/i]
1. Let \( x \) be the number of additional classes Micchell needs to take.
2. The total submissiveness rating for the 40 classes he has already taken is \( 40 \times 3.975 \).
3. The total submissiveness rating for the additional \( x \) classes, assuming he receives a rating of 4.0 in each, is \( 4x \).
4. The new total number of classes will be \( 40 + x \).
5. The new average submissiveness rating (college potential) should be at least 3.995. Therefore, we set up the equation for the new average:

\[
\frac{40 \times 3.975 + 4x}{40 + x} = 3.995
\]

6. Multiply both sides of the equation by \( 40 + x \) to clear the denominator:

\[
40 \times 3.975 + 4x = 3.995 \times (40 + x)
\]

7. Distribute \( 3.995 \) on the right-hand side:

\[
40 \times 3.975 + 4x = 3.995 \times 40 + 3.995x
\]

8. Calculate \( 40 \times 3.975 \) and \( 3.995 \times 40 \):

\[
40 \times 3.975 = 159 \quad \text{and} \quad 3.995 \times 40 = 159.8
\]

9. Substitute these values back into the equation:

\[
159 + 4x = 159.8 + 3.995x
\]

10. Subtract \( 3.995x \) from both sides to isolate \( x \):

\[
159 + 4x - 3.995x = 159.8
\]

11. Simplify the equation:

\[
159 + 0.005x = 159.8
\]

12. Subtract 159 from both sides:

\[
0.005x = 0.8
\]

13. Divide both sides by 0.005 to solve for \( x \):

\[
x = \frac{0.8}{0.005} = 160
\]

Conclusion:
Micchell needs to take 160 more classes to achieve a college potential of at least 3.995.

The final answer is \( \boxed{160} \).