What are the chances of a high school drop out getting into Columbia University?

The chances of a high school dropout getting into Columbia University are extremely low, bordering on impossible. Columbia, like other Ivy League and highly selective universities, requires a high school diploma or equivalent as a fundamental admission requirement. They evaluate applicants based on a rigorous academic record, which a dropout lacks. While exceptional circumstances might theoretically exist, they would be extraordinarily rare and would require far more than simply overcoming a lack of high school diploma. The applicant would need to demonstrate exceptional talent and achievement in other areas to even be considered, and even then, the odds remain incredibly slim.