Like some other people have said, it's definitely subjective. Some things are a doozy for some people and absolute hell for others.
But I'd always say language A-levels are absurdly challenging. You just have to cover so many bases - not only do you need the knowledge & analytical skills to write what's essentially an English literature essay (alongside a translation & another essay), you need to do it in a different language and make sure your grammar & lexis in that language are up to scratch the whole time! With a 15 minute speaking exam on top of that, no less. It's hell hahah.