First of all, I don't think anyone knows if "quantitative reasoning" WAIS subscores are indicative of talent in higher mathematics. It's possible that you would make a lousy accountant but a good mathematician. You probably already know whether you're "good with numbers," and you surely already know that what you do in advanced mathematics doesn't have a lot to do with what you're asked to do on a WAIS. It's unfortunate that even people who should know better tend to conflate quantitative fluency with mathematical talent. Speaking from my own experience, I reliably score around the 30th percentile for "arithmetic fluency," although there is nothing wrong with my ability to reason mathematically. But you should probably get someone else to do your taxes.

Secondly, ADHD often shows up as irregular profiles in skills and aptitude testing. Whatever the WAIS-III is worth, it needs to be interpreted carefully and in context. You can't really conclude much from a single subscore.

First of all, I don't think anyone knows if "quantitative reasoning" WAIS subscores are indicative of talent in higher mathematics. It's possible that you would make a lousy accountant but a good mathematician. You probably already know whether you're "good with numbers," and you surely already know that what you do in advanced mathematics doesn't have a lot to do with what you're asked to do on a WAIS. It's unfortunate that even people who should know better tend to conflate quantitative or computational fluency with mathematical talent. 

Speaking from my own experience, I reliably score around the 30th percentile for "arithmetic fluency," although there is nothing wrong with my ability to reason mathematically. But I'm not the person you should ask to do your taxes.

Secondly, ADHD often shows up as irregular profiles in skills and aptitude testing. Whatever the WAIS-III is worth, it needs to be interpreted carefully and in context. You can't really conclude much from a single subscore.