If You Have them by the Math and French, their English and Science will Follow?

There is a popular saying “If you have them by the balls, their hearts and minds will follow” Anyone with testicles is painfully familiar with the gravity of this saying. I’m wondering if in education, anyone who is good at math and foreign language (especially French) is rather forced to be good at everything else, including English, Science, and History

Have you ever met someone that knew Math and French that wasn’t really smart across the board?