According to mbctimes.com reported by John Chatin :
Best education system in 2015 : South Korea
East Asian nations continue to outperform others. South Korea tops the rankings, followed by Japan (2nd), Singapore (3rd) and Hong Kong (4th). All these countries’ education systems prize effort above inherited ‘smartness’, have clear learning outcomes and goalposts, and have a strong culture of accountability and engagement among a broad community of stakeholders.
Reference: mbctimes.com (2016) 20 Best Education Systems In The World. Available from < http://www.mbctimes.com/english/20-best-education-systems-world >[19 Feb 2016]