No formal training in math. Made insane contributions to mathematics including solving "unsolvable" problems.
> A child prodigy by age 11, he had exhausted the mathematical knowledge of two college students who were lodgers at his home. He was later lent a book written by S. L. Loney on advanced trigonometry.[18][19] He mastered this by the age of 13 while discovering sophisticated theorems on his own. By 14, he received merit certificates and academic awards that continued throughout his school career, and he assisted the school in the logistics of assigning its 1,200 students (each with differing needs) to its approximately 35 teachers.[14]: 27 He completed mathematical exams in half the allotted time, and showed a familiarity with geometry and infinite series. Ramanujan was shown how to solve cubic equations in 1902; he developed his own method to solve the quartic. In the following year, he tried to solve the quintic, not knowing that it could not be solved by radicals.
If there was a method of raising kids like this "scientifically" , I bet a good portion of the worlds GDP would be put into this field of research