If you want to draw an analysis between Grant and Lee, Grant graduated from West Point in 1843, ranking 21st in a class of 39. Lee graduated second in his class of 46.
Grant was under educated.
And Lee did not have any demerits. Do you realize what an accomplishment that is? (of course you do)
Grant never beat Lee on a battlefield on equal terms. Grant overwhelmed Lee with superior manpower and firepower.
Grant was under educated.
Oh, if class rank is the criteria, then Jefferson Davis, who graduated 23rd of 32, is even more under educated. Then there's Longstreet--54 of 56. Harry Heth must have been barely literate, since he was dead last. So was Pickett.
Considering he was the most consistently victorious general of the War of Southern Rebellion he was more like a late bloomer.