Hi i have referred this for the dropdown box validation. It's working fine for only one dropdown if i have more than one means it not showing correctly
$(document).ready(function () {
    $('.default').dropkick();
    $('.example_form').validate({
        highlight: function (element, errorClass) {         
            $(element).siblings('.dk_container').addClass('error');  
            $('.dk_toggle').css('border', 'none');
        },
        unhighlight: function(element, errorClass) {
            $(element).siblings('.dk_container').removeClass('error');  
            $('.dk_toggle').css('border', '1px solid #ccc');
        }
    });
});
Here is a fiddle
how would highlight the error for each field
 
     
     
    