Jquery error

hi, i have problem with jquery (Uncaught ReferenceError: $ is not defined)
https://prnt.sc/658yXSa8NVa_

<div class="col-md-6">
<label for="Id Prog" class=" control-label"> Program </label>
<select name='id_prog' rows='5' id='id_prog' class="form-select {{ $errors->has('id_prog') ? ' is-invalid' : '' }}" required autofocus ></select>
@if ($errors->has('id_prog'))
<span class="invalid-feedback" role="alert">
{{ $errors->first('id_prog') }}
</span>
@endif
</div>
<script type="text/javascript">
$(document).ready(function() {
$("#id_prog").jCombo("{!! url('daftarwilayah/comboselect?filter=program:id:PROGRAM&limit=WHERE:JENIS:=:'.'4 Wilayah') !!}",
{ selected_value : '{{ old('id_prog') }}' });
</script>

i was remove <script src="https://cdn.rawgit.com/igorescobar/jQuery-Mask-Plugin/1ef022ab/dist/jquery.mask.min.js"></script> bbut the problem not solve. i use jquery jcombo, still error and not show the option.
on header :
<link href="https://fonts.googleapis.com/css?family=Lato:300,400,400i,700|Poppins:300,400,500,600,700|PT+Serif:400,400i&display=swap" rel="stylesheet" type="text/css" />
<link href="/css/bootstrap.css" rel="stylesheet">
<link href="/style.css}" rel="stylesheet">
<link href="/css/swiper.css}" rel="stylesheet">
<link href="/css/dark.css" rel="stylesheet">
<link href="/css/font-icons.css" rel="stylesheet">
<link href="/css/animate.css" rel="stylesheet">
<link href="/css/magnific-popup.css" rel="stylesheet">
<link href="/css/custom.css" rel="stylesheet">
<script type='text/javascript' src='https://platform-api.sharethis.com/js/XXXXX' async='async'></script>
on footer
<script src="/js/jquery.bootstrap.js"></script>
<script src="/js/jquery.js"></script>
<script src="/js/plugins.min.js"></script>
<script src="https://maps.google.com/maps/api/js?key=XXXX"></script>
<!-- Footer Scripts============================================= -->
<script src="/js/functions.js"></script>

here is my other sample https://smkitattaqwa9.sch.id/test
please let me advise for this problem, thank's.

Hi team, thanks for your advice before, that still not solve my problem.
the problem can be solve when i removed jquery.js
and i must include jquery-library.js and jquery.migrate.js, but i have conflict.

do you have advice for my conflict?, thanks.

ok, it's was clear, problem solve. Thanks.