The period divides neatly into two sections - Weimar and Nazi Germany - but the exam does not make this differentiation, so I have simply organised the links below as one group.
Schools History website - this page from a well put together school history site, provides some good links to start with.
Spartacus - Weimar - The Spartacus pages on Weimar.
Spartacus - Nazi Germany - The pages on Nazi Germany
Third Reich Pages - Extensive pages on different aspects of the Third Reich.