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Form direction to .php on localhost

I need to make a form submission. At the moment I have created a post with has the URL…

http://localhost:8888/japan/quiz/

… and includes a form with the following html:

<form id="quiz" action="http://localhost:8888/japan/grade.php" method="post">
<radio buttons>
</form>

The grade.php form is my main folder (child theme folder), but if I press submit I just get a 404 page. I would like to know:

Thank you!