I would like to suggest training based on the number of credits available

I propose training. I would like to sell pre-purchase packages and suggest that people choose their training based on the number of credits available on their subscription.

If you have the number of available credits in an Excel doc, you can use the Spreadsheet To Form widget, to populate the "Available Credits" fields, so you can show fields in your form based on the available credits. Please check this guides:

https://www.jotform.com/help/442-How-to-Use-the-Spreadsheet-to-Form-Widget

https://www.jotform.com/help/316-How-to-Show-or-Hide-Fields-Base-on-User-s-Answer

Let us know if you need more help.