I want to restart module 3. From scratch. I'm stuck on it from last one week. How to force pull the module 3?

Please tell me how to start the module 3 again from afresh.

You might find this helpful: https://stackoverflow.com/questions/4114095/how-do-i-revert-a-git-repository-to-a-previous-commit

I can not find my git log for the last module commit id.