Initial set-up

git clone https://github.com/thomasstr/School.git
cd School

You´ll want to add a remote called upstream pointing to the canonical repository. This will allow you to easily keep your local master up-to-date.

git remote add upstream git://github.com/thomasstr/School.git

Assuming you already have master checked out, run:

git fetch upstream
git merge --ff-only upstream/master