I must ask; why do you say that people who don't do sciency subjects ( you refer to academic subjects ) underachievers?
Basically you have said that , for example, even if you get an A in your Advanced Higher Art, your an underachiever.
To be honest, some of the most successful people in the world, businessman, designers, sportsmen etc were not good at school. Does that make them under-achievers too?
It's not fair to brand those who are not naturally talented in Science subjects as being under-ahchievers. In fact, it's quite unfair.