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Many schools will be using BMIs to convert 2015 MCAT scores to 2014 equivalents.
The equation is:
2014_Equiv. = 2015_MCAT / [(|BMI - 20|/10) + 1.25]
I admit this is pretty unfair, though, since admissions chances are already inversely related to BMI, but I guess they have to cut some people out somehow...
I think your fat-factor is a little too extreme, so I came up with a model similar to what you invented but discounted the effect of BMI a little bit. But for a back-of-the-envelope calculation in 2 minutes for a forum post, I think you were pretty close. I did some plotting in Wolfram Alpha and came up with this plot, shown as both a contour plot and as a mesh plot:
The w axis is your BMI. Applicants are rewarded for having a BMI exactly in the middle of the range associated with "lowest risk of death"...aka BMI=22.5
The o axis is your 2014 MCAT score, i.e. from practice tests.
The unlabeled axis is your projected 2015 MCAT score, factoring in both variables.
The mesh plot is good way to look up your actual projected 2015 MCAT score if you know both of your measurements. But the contour plot is really more interesting...contour lines represent constant 2015 MCAT scores. So you could see, for example, that someone with a BMI of 30 who got a 37 on the 2014 practice tests would get the same 2015 MCAT as someone with a BMI of 24 who only scored a ~31 on those practice tests.
That is so unfair!