Interesting little chart from The Conversation. The data is US derived but it would seem broadly applicable to anywhere.
This also tallies with the surplus of data that links everything from life expectancy, general health and life satisfaction to education. The simple rule seems to be, the more you get the better you do at everything.
If you dropout though it’s never too late to keep studying. I dropped out of high school in 1978 and am still studying right now. These days I’m learning Python programming and Data Science for free on EDx and Coursera. You get the benefits without all the accompanying crap