Mathematicians who overcame academic failure to achieve success [closed]

The analytic number theorist Hua Loo-Keng overcame abject poverty, handicappedness, political persecution; for more information refer to one of his faithful biography.

Charles Hermite overcame much too, but in different aspects; he failed nearly every math exam that he was to take.

To supplement, the analytic number theorist Chen Jing-Run, the man closest to Goldbach conjecture (who proved "1 + 2") and a student of Hua Loo-Keng, overcame unemployment, poverty, and political persecution; the serial political persecution done unto him was even more violent. But he survived anyway.

Srinivasa Ramanujan was such a mathematician. He failed to got admitted to college but he became one of the best mathematician of $20$th century.

Evariste Galois failed to enter to Ecole Polytechnique twice.

Andrew Wiles with his Fermat proof is an example of massive struggle. He worked on the topic for 9 years and got demolished when presenting an erroneous proof after 7 years. There were several additional problems, but I forgot the details. You can read about it on Wiki and in much detail in the very accessible "Fermat's Last Theorem" by Simon Singh.