India’s tech titan Nandan Nilekani faces an uphill battle overhauling the country’s education system amid exam scandals, student protests and rising youth unemployment. Nilekani, co-founder of technology behemoth Infosys, was appointed head of a national task force for exam reforms following widespread anger and controversies over alleged paper leaks involving the competitive exam for aspiring doctors, the National Eligibility Entrance Test. Analysts say the real test for a reformer best known...