calculating AA?

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With those scores the AA is 19, but look at each individual score added up as in above post because the TS is rounded to the nearest whole number. Could be anywhere from 17.5 to 18.4. In either case AA comes out to 19 rounded.
 
TS is not the average of bio + gen chem + orgo, it is your scaled score out of 100 natural science questions without regard to subject. If you have a Kaplan book, they have the scaling used in the back of the practice test section. It may also be online somewhere or in other study guides, I don't know.
 
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