I am in my second year and started my studies online in Fall 2020. I had two refusals before...The latest one was purpose of visit and financial status. For the former I wrote a letter addressing reasons why I would come home and the latter I paid my full tuition and room and board, showed 8000CAD in my parents' account, my entrance scholarship and a sponsorship letter from my dad's work that was notarized with a bank letter saying that they would help me where my parents could not.
Hope this helps! Also I am a believer and Christ reallly came through for me!