What does the average IQ of a certain job mean?

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I tried several IQ tests and I scored 103 in all of them. I am studying to be a pharmacist.
Google says pharmacists IQ averages at 120.
Ironically I used to study hard and get good grades up until I learned that my IQ is 17 points below the average for my major.
Does that mean that I am bound to fail? Or can I just study hard?
I don't get it. Does that mean that I will never ever be a good pharmacist?
I understand my lectures, and I am doing good academically for all what matters.