try this
var AddData = [];
$.each(GetStudent, function (i, item) {
AddData.push({ Category: "Category", StudentCode: item.StudentCode, StudentAddress: item.StudentAddress, StudentGrade: item.StudentGrade, StudentName: item.StudentName, EmployeesCount: 65 });
});
use
JavaScript Array push() Method[
^] to append the data in an array.