form-submission.js

    $('[name="student-profile-form"]').submit(function(event) {
        event.preventDefault();

        let formMethod = $(this).attr('method');
        let url = $(this).attr('action');
        let fields = [];

        for (let i = 0; i < event.target.length; i++) {
            fields[event.target[i].name] = event.target[i].value;
        }

        $.ajax({
                url: url,
                type: formMethod,
                data: {
                    action: event.target['action'].value,
                    user_email: fields['user_email'],
                    first_name: fields['user_meta[first_name]'],
                    last_name: fields['user_meta[last_name]'],
                    itb_address: fields['user_meta[itb_address]'],
                    itb_city: fields['user_meta[itb_city]'],
                    itb_country: fields['user_meta[itb_country]'],
                    itb_postal_code: fields['user_meta[itb_postal_code]']
                }
            })

            .done(function(response) {
                if (response.success) {
                    toastr.success(response.data.message, 'Success!');
                    location.reload();
                } else {
                    toastr.error(response.data.message, 'Error!');
                }
            });
    });