Once you have created a form, or uploaded a form from our forms pack, in order for that form to be visible and used by visitors to your site it must be added either to a blog post or a blog page.
If the form is going to be used repeatedly throughout the school year you would probably select to publish the form on a page. If the form was to be used for a specific task you would publish it in a post. (more on the difference between a page and a post in Wordpress here).
You are not restricted on the number of times a form could appear so the "write a blog post" form could be used for multiple different tasks and appear in several separate blog posts.