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<p>How can you know if you are going to get a C- or a D? You only know what you are getting when you switch, not your final grade. And C- is P, as far as I know. Anyway, if you are getting a C- or a D, you should change to P/NP and then work hard to bring it up to a P. The only grades where you strategy makes sense is D+, D, and D- (do they give D-s?). In the vast majority of cases, better to gamble you can pull out a C- and get a P then worry about the case where you get a D-, D, D-.</p>
<p>Game it out if you want.</p>
<p>Let’s say you have 12 credits of B+ and one 4-unit class you aren’t doing well in.</p>
<p>If you take it P/NP, and get C- or better, you have a 3.3 GPA. Law school and UC GPA.</p>
<p>If you take it P/NP, and get a D+ or lower, your law school GPA is 2.475, but your UC GPA stays 3.3.</p>
<p>If you take it for a grade and get a D+, your GPA is 2.74.</p>
<p>Now, if you DON’T go to law school in the end, you are way better with the NP, because you keep you 3.3 UC GPA. No one will really ever know or care about your NP.</p>
<p>So if you are SURE you are going to law school and SURE you are going to get a D+, D, or D-, it might be arguable one should do as you suggest. But I don’t know how anyone could possibly be sure about any of those things. If you’re going to get an F anyway, of course, you’re much better off doing NP.</p>
<p>Moral of the story if you are in over your head is figure that out fast and drop the class. ;-)</p>