I'm not sure what's normal, but my daughter was recently IQ tested and her WMI was 148, which seemed shocking considering she's bee previously dx with ADHD and has benefited a great deal from Adderall. This is one of several reasons she's scheduled for a comprehensive evaluation with the same tester in June.
I will say that her overall score is higher now, at age 8 after nearly a year on meds, than it was when she took the WPPSI around age 5, before meds. Her FSIQ was more than a standard deviation higher. The tester who did the WPPSI has commented that she though DD would test higher in the future because she was so clearly not playing along with the test at 5 and pre-meds.
As a more recent datapoint, she took the CogAT through our school district 6 months before meds and 6 months after, scored at <97 %ile age rank before, and 99 %ile age rank after.
