Failed Git Assessment, not sure why

I did not pass my git assessment and I have no idea why. This is what the e-mail told me:

The questions you missed were:
Git branch: drawings
fatal: ambiguous argument ‘student/drawings’: unknown revision or path not in the working tree.
Use ‘–’ to separate paths from revisions, like this:
‘git […] – […]’
Git branch: master
fatal: ambiguous argument ‘student/master’: unknown revision or path not in the working tree.
Use ‘–’ to separate paths from revisions, like this:
‘git […] – […]’
Git branch: pictures
fatal: ambiguous argument ‘student/pictures’: unknown revision or path not in the working tree.
Use ‘–’ to separate paths from revisions, like this:
‘git […] – […]’
Git branch: together
fatal: ambiguous argument ‘student/together’: unknown revision or path not in the working tree.
Use ‘–’ to separate paths from revisions, like this:
‘git […] – […]’

I can move from branch to branch in ubuntu, and when I do, my windows file explorer changes with the image folder depending on what branch, the branches change, and I did successfully merge the files in together and finally master. The code in visual studio also changes depending on which branch I am in.

Please help. I have no idea what I did wrong.