Hahaa, cheers. Firstly don’t listen to what anyone else says, as it all depends on what you want to do. My friend wants to study History at university so that’s her favourite but with me it’s probably my least favourite. I would advise you to before you pick your subjects, to look at the possible course you want to study at university if you want to go. I've applied to do Biology and didn't take Chemistry and some universities downright won't accept me without Chemistry or another science. Because of this I wish I'd maybe taken Psychology instead of History as it's more science based.
The depth isn't too bad, it's more than GCSE but if it only SL it shouldn't be too hard for you. It's annoying having to self-learn but sometimes it's better because it sticks in better. How fast you go will depend on the teacher really, so it does all depend on the teacher. Luckily this year I have a really good teacher so it's not too bad. But if you’re considering HL, then HL only have 2 extra lessons a week to learn a different era of History so they will go quicker, but that’s because in HL you’re expected to be able to keep up. I think HL at my school are doing American history.
There is quite a lot of common sense, such as the viewpoints I mentioned, with Russian history during the time of Lenin, historians in Russia at that time will obviously be positive about the regime but Western historians are influenced by the Cold War and so are negative etc. etc. You just need to know key things like that and it's not too hard.
We usually did a bit of background about the dictator, such as how Stalin was brought up (this lets you see how his upbringing effected his dictatorship) and also about the Russian dictatorship before Lenin started the revolution, as it's easier to understand, as you can see how certain people were able to take power due to the bad situation in the country at the time. How history is taught will also depend on the teacher as my teacher does the worksheets himself.
At SL you do 3 single party states and we've done Lenin, Stalin and Hitler. It can be easy to mix up Lenin and Stalin, as Stalin comes straight after Lenin and it's the same sort of policies with it all being Communism but you just have to learn it in order really. But there’s several single party states to choose from so it’ll just depend on which your school chooses, you could ask your school now what you’ll be studying so you’ll know if you’re interested or not.
This year we're doing the Cold War and the Arabs and Israelis. In the exam there are two papers. One is essays, you’ll have to do an essay on single party states and the Cold War (you get to pick from a choice of essay questions and you can almost get away with knowing only one dictator really well for single party states.) There’s also source work which is common sense, this one is on Arabs and Israelis. You’re given say a cartoon from a newspaper and you have to say why it’s accurate or biased etc. Such as, if it's from a British newspaper about Stalin’s policies, it’s going to be biased as Britain didn’t agree with Communism, but it's also accurate as it lets us see how the British felt about it.
Sorry to write loads, but I wish I was better advised with my subjects