help: input form html, php

hello everyone,
i'd like to have help here with this form of exxercises in this website here
www.englisch-hilfen.de/en/exercises/questions/simple_present.htm
well in this form its seems like a code html but i don't know how it gets results and answers after clicking on checking button or show asnwers and this is the form

<form id="0" name="exercise" method="post" autocomplete="off">
<input type="hidden" name="cat_name" value="Questions">
<input type="hidden"…
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help: input form html, php

See original post by ifnawi