SEOUL- The number of elementary, middle and high school students with an immigrant background has reached a record high, government data showed Wednesday.The number of students from multicultural or foreign-nationality families came to 210,838 as of April 1, up 4.3 percent from a year earlier, according to the data from the education ministry and the Korean Educational Development Institute.They also accounted for 4.3 percent of all students enrolled at all elementary and secondary schools here.By parents' country of origin, Vietnam took the largest share at 30.9 percent, followed by China …READ FULL ARTICLE