First off, I must say that Education is very good and i don't dispute the fact that it's very vital and necessary for human development, it can put you in a position to be successful no doubt but being a graduate is not a 100% guarantee for one to be very wealthy, one can be very sound academically but lack some basic skills of acquiring wealth. Also one can still have some good knowledge of certain skills but if there's no zeal or self confidence in earning a living through it then your education on those skills can be said to be a waste since you ain't making effort to earn from it.
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.
I have heard from my parents then years ago when they were young, that if they studied well, then the government (it was communism during their time) would choose them, give them a good, high-paying job and they would also be appreciated in the society. They grew up with this mentality, if you want to achieve anything in life, you have to enter university or you'll be a physical labour forever but in reality, things are very different today. No one cares about your education if you can't market yourself. I had a mate in university who had all the A+ grades but she still works at McDonalds because she wasn't from a rich family and was a shy girl.
On another hand, there are many people who have never studied at school and university but earn six figures. Khaby Lame is a good example, he never studied at University but used the right moment at the right time and is earning much more than people who work 12 hour shifts a week and do the hardest jobs.