If you are enrolled in a package course of more than 1 course, you will be issued CoE individually for each course. You can apply to 2 or more courses as long as they are related and the next course is higher than the previous one, for example: Package of Certificate IV in Business + Diploma of Business. Please refer to this AQF (Australian Qualification Framework) website for the course levels information.

Source: https://immi.homeaffairs.gov.au/visas/getting-a-visa/visa-listing/student-500#Eligibility

To get the CoE, you need to engage with the education agent or the education provider directly and start the application process. When you have met the requirements, including paying the requested fee & providing the necessary documents, the education provider will issue the CoE so you can proceed to the next step, which is visa application.

• maintain your active enrolment with registered course & education provider
• maintain satisfactory attendance & course progression for each study period
• maintain your enrolment to the same ASQ level or higher should you wish to change your course.

Source: https://immi.homeaffairs.gov.au/visas/already-have-a-visa/check-visa-details-and-conditions/see-your-visa-conditions?product=500#

As mentioned above, if you failed to comply with any of those requirements, the education provider will send a warning letter to you and also invite you to have a study intervention strategy to fix your issue. If you did not respond or after multiple interventions you still failed to meet the requirement, the education provider must cancel your enrolment and notify the immigration about the reason for your cancellation.

Sources: https://www.asqa.gov.au/guide-reporting-obligations-cricos-providers/breach-condition-82022c

Lawfully, you have 28 days to take the next step.

• re-enrol to the same course & education provider
• enrol to another course within the same education provider or new education provider, but must maintain the same AQF level or higher
• apply for other visas; however, if you apply for other visas while your student visa is still valid, you still have to meet your student visa condition until your student visa has ceased, which means you need to re-enrol / enrol in a registered course & education provider
• leave Australia within 28 days from the date of your enrolment cancellation