What is meant by sending / uploading certificates / degrees / language tests? Why do I need to provide these?
Uploading documents means you have to scan your documents and send them to us through the Internet. This documentation is necessary to prove that you are eligible and have the specific reqiurements needed.

For example:
If you wish to apply for an MSc study, you need to show that you have a BSc diploma.
If you wish to apply for a PhD, you have to show that you have an MSc diploma and also the transcript of records showing the courses for the specific programme.

If you wish to apply you have to make sure that all your documents are in order. An incomplete application will not be considered in the selection process.

Note: It is important to submit your language proficiency test (some universities have higher requirements than others). Please, see the website of the university you are applying to.