For the sake of convenience of grader of Assignment, we set up a separate folder B1 containing an exported unitypackage which grader can import in an empty project, run and test it.
Since B2 Package is just too big(over 100MB), so that we decide to share a google drive link of B2: https://drive.google.com/open?id=0Bx-qQezyPT6GUUd3VVBmVHFaY1k