while uploading the educational documents for document verification after ITA, do I need to only upload the final certificate that I received at the end of the course from the university? Or I need to upload the mark sheets as well ?
Only the final degree certificate needs to be uploaded. However transcripts (mark sheets) maybe upload if available they are not required. When I was applying I leaned towards providing extra information if possible.
Your answer is also listed on this page under "Proof of studies"
And congrats on the ITA