Peter - Not sure if you are speaking from an admissions viewpoint or validating classes viewpoint.
As far as admissions, that is why they want your 1st semester college transcript.
From a validation viewpoint, you will be given validation tests during Beast.
WP is not like the civilian colleges where you could graduate early by validating.
At WP, you won't graduate any earlier. You are there for 47 months. Period.
Some advantages of NOT validating Calculus and/or Chemistry:
a) taking these at WP when you have already taken them at another college will possibly enable you to make a very good grade in that class. GPA will benefit!
b) you will get a very good foundation in these core subjects
c) Plebe year is stressful enough. If you have a class or two that are 'easier' for you due to the fact that you have already taken them, then you will be able to focus more on the more challenging areas of your academics and Plebe life in general.
Some advantages of validating Calculus and/or Chemistry:
a) you want to pursue Math type major or Chemistry major
b) you would be bored taking these classes again
c) you want to double major
Just things to consider when you are making the decision to validate IF you are given the opportunity to do so.