No need to apologize, Aden! I'm happy to help you understand how this all works.

There are quite a number of possible WAIS-IV profiles that could result in FSIQ 128. You could have an even profile, with a lot of strong 13s, 14s, and 15s among your subtest scores, or a spiky one, with some essentially average scores (10s, 11s, 12s) and some very high scores (17s, 18s, 19s). You might even have some extreme strengths paired with significant weaknesses. The subtests comprising your index scores could be split in a similar way, or they could be more consistent within indices. If you have marked learning preferences, some of the indices might be higher than others.

The way scoring works for the index scores (VCI, PRI, WMI, PSI) and the composite scores (FSIQ, GAI) is that subtest scaled scores are added, and then the sum of scaled scores is converted to a standard score. The conversion doesn't take into account how you obtain that sum of scaled scores. So, for instance, if the sum of scaled scores = 138 converts to an FSIQ = 128 (don't take this as the real numbers, as I don't have the tables in front of me at the moment), there will be no distinction between obtaining this from 8 14s and 2 13s (mostly Superior with a couple of High Average) vs 6 19s (Very Superior, at the top of the scale) and 4 6s (below average). Functionally, of course, you might expect pretty noticeable differences between someone who is uniformly a bit stronger than average across the board, and someone who has exceptional strengths in the upper extreme of the population, but also has deficiencies in certain areas (the latter individual is likely to be twice exceptional--having both extreme gifts and some kind of learning disability).

Subtest scaled scores are based on conversions from raw scores (the actual number of points obtained on the task) to scaled scores using age norms. On the WAIS, the age norms are slightly less critical than on the WISC, but they do still matter. At age 16, you would be compared to other 16-17 year-olds, while, say, your 32-year-old physics teacher would be compared to other 30-39 year-olds. If you wanted to compare you to each other, based on your actual performance at this moment in time, you could convert both scores using the reference norms. This would compare your absolute performance, rather than your rank order among your age peers.


...pronounced like the long vowel and first letter of the alphabet...