$(document).ready(function() {
  $("#dontknow").each(function() {
    if (this.checked) {
      $(".school").show();
    } else {
      $(".school").hide();
    }
  });
  $("#dontknow").click(function() {
    if (this.checked) {
      $(".school").show();
    } else {
      $(".school").hide();
    }
  });
});