Hi! I’ve just started doing AQA A level History with Tudors as my breadth topic. A few of my teachers have said it’s “as difficult as two A-levels” because you basically do double the exams during term (especially if you are learning the modules concurrently like I am). Honestly, it is difficult, but no more difficult than any other A-level, especially other humanities A-levels like Politics. For context, I didn’t do GCSE History but got 9s in lit and lang, and after a term of sixth form I am around a low A in History. As long as you keep up with the content, do some extra reading and revise well, you should be fine.
If (like me) you are interested in politics, the Tudors module offers quite a bit: there is a heavy emphasis on monarchical political authority, government, and foreign policy during late medieval and early modern England. However, there are also links to religious, economic and social history in the module. If you did A-level Politics, you may be writing essays in a similar way, but there is more of an emphasis on contemporary politics as well as liberalism, Marxism, Thatcherism etc. The stuff about politics is not from my experience, but from friends who also do A level politics and history.
I can’t really comment on Nazi Germany, I do the Russian Revolution instead
Oh and finally, in terms of resources I find the best thing to do (esp for Tudors) is to read books on the topics by published historians, as this is what you get assessed on in the real Tudors exam. I’m currently reading “Tudor England” by John Guy - I wouldn’t recommend reading it cover to cover because it’s the opposite of light reading (there is six pages about the price of corn), but skimming through sections on certain events and historigraphical debates is really useful because it provides you with analysis and gets you used to reading texts with difficult language.