And if there are major discrepancies in scores (i.e. some 10s and some 19s), that might suggest a learning disability of some sort? Also, how would the GAI be calculated if there is hypothetically the aforementioned discrepancy, since both the FSIQ and GAI can differ?

Also, do certain subtests have more weight to them than others, similar to class tests that have 65% the weight of your final grade?