Can I limited submissions per product sold?

I can only hold a class of 6 students. Therefore can I limit the quantity of submission to avoid over selling?

The Payment Tools do not have their own inventory managment module. So it will be difficult to have this feature using only the Form Builder.

However, you may want to use the Inventory Widget instead and combine it with the Payment Tool to have inventory functionality and payment/order function as well.

link: http://widgets.jotform.com/widget/inventory

Here is the demo Inventory Form you can test http://form.jotformpro.com/form/51413853223953?

If you submit the form, you will see the invenroty available balance get updated.