does school make you dumber or smarter?

lets study some famous examples:
if school makes you smart then school should've been able to turn black soience man into a real astronomer, but it didn't, he's just a fag that says dumb shit on tv. all that college, graduate school and postdoctoral research didn't make black soience man smart.
judging from that, seems like school can't make you smart

lets test the reverse hypothesis, does a lack of education makes you dumb?
well the world's most famous climate expert is dr. gretchen thunderburp, phd. she never even graduated high school, but she has a phd and is a famous, influential scientist. lack of schooling didn't seem to hinder her career growth.
bill gates, world's richest and most successful man, also the world's leading vaccine expert. failed out of college freshman year. lack of education didn't hold him back, maybe it even helped him.