When I take online IQ tests I try to get the lowest score possible. You get fairly interesting results.
When I went to college I took classes that I enjoyed and did enough work to get the grade I wanted. In Primary classes B or better. In secondary classes, C or better. Everything else D or better. I got some As, some Bs, a lot of Cs and 1 or 2 Ds. I took the ACTs when I was a Junior and I took what one would consider light classes in high school and I got a 24. Of course that was back in the late 80's.
When I joined the Navy I took their entry test and scored high enough to be considered to go into the Nuclear Engineering program, so go figure.