You can install knoppix to your hard drive (wiping out
your hard drive!) with knoppix-installer. Then you will
be able to add scheme like any other debian package.

Or you can remaster your own custom version of knoppix
to include the mit-scheme package. There's plenty of
documentation discussing how to remaster knoppix if you
look for it and your fellow classmates might be eternally
grateful.

But if you are really just concerned with running MIT
scheme, you could just get the binaries from
http://www.gnu.org/software/mit-scheme/, untar them
onto a USB thumb drive, and run them from there. I can't
guarantee that it will work, but I suspect it would. No
need to fuss with the Debian package.