When you upgrade your course, you pay the price difference to receive the additional number of resources and the additional number of months' access.
For example, if you upgrade from a PTE Silver to a PTE Gold, you will pay USD$60 and receive an additional 3 writing assessments, 3 speaking assessments, and 1 tutorial. You will also get an additional 3 months' access.
To compare courses, see our website.
If you have any questions about the validity of your course, see this article: How long is my course valid for?
If you still have questions you can also email us at firstname.lastname@example.org