No academic success does not measure intelligence. I'm a psychology student - this semester I'm taking experimental psych and have to do a research study. My partner and I had to book a room for the study. She couldn't figure out how to time 3-45 minute studies with 30 minutes in between each study for set up in the allotted time we had. I sat down and banged it out in about 8 seconds. She has a 4.0 GPA, making straight A's in everything, I struggle to stay above 3.0 with B's and C's in my classes. Do I feel less intelligent than her? No, not at all. I have common sense, which she lacks big time. I'm also 58 to her 22 and I think life experience also has a lot to do with intelligence.