The new exam scoring is very confusing. My older two took the three part SAT/PSAT, so the scoring was easy to understand. If I am wrong, someone please correct this explanation.
I think what is being said is that it is the math score (say 710) divided by 10, so 71. Then the Reading and Writing converted raw scores, which will each range from 8 to 38. Add those together - say 32 and 35, so 67. Then multiply 67 by 2 and add 71 for a selection index of 205.
I think that the PSAT scoring going back before the three part SAT/PSAT was the math section plus two times the verbal. What is interesting is that while I would expect the heavier verbal weighting to favor girls, historically, more boys have been NMSF (though there are more girls taking the PSAT than boys).
