Also I've heard several people complain about having good grades, being 1st class graduates but find it difficult to secure good paying jobs, imagine someone struggling to achieve good grades in the university but find it difficult to earn a living and at the end settle for minor jobs while there are many dropouts with good skillsets as well as being creative and think outside the box, and are bosses of big organisations and companies.
Well it's not basically about being educated or graduating with the best grades that makes you wealthy, it's about determination, being consistent and also persistent cause success and wealth are not achieved in one day or immediately after graduating. In as much as you have good grades, you must still improve your skills, not only job skills, marketing or management skills but your critical thinking and problem solving skills.
Being a graduate is not a sufficient condition in order to become wealthy, but having the cobb-douglas production function as the basis, it is one of the necessary ingredient in order to increase income. Per the equation, labor productivity will increase the income of an individual and household. Labor productivity is directly correlated to the educational level of the individual and household. Hence, we can say that education is highly correlated with the income of the individual/household.