Hello! I sat my a-levels in 2024 and yesss the amount of content for the breadth study can be so overwhelming, but try not to stress about it too much. I found the breadth study so much more overwhelming than the depth study, but when it came down to mocks and exams, it was always my stronger paper. I wouldn't recommend trying to learn every fact in the textbook because that's almost impossible and you risk making mistakes with time periods etc.. How are you currently trying to memorise the content? I relied heavily on flashcards for this and it seemed to work for me but I know others preferred mindmaps etc.. In terms of the essays, it's more important to show that you have an understanding of continuity and change over the time period in question than it is to write down every fact you remember. Rather than trying to include a lot of information for each point, treat the essays as you would in the depth study in terms of the balance between facts and analysis, while making sure to cover the time range given in the question. The nature of the breadth study is focused on the chronology of change/continuity over time, and so as long as you can demonstrate this you don't need to infodump in your essays as all. I presume you're on the AQA exam board? If so, make sure you have a broad understanding of the 'narrative' of each chapter i.e. important developments and how things changed, as well as some specific facts. By having an understanding of the broad themes of each chapter you are already putting yourself into a good place because that then enables you to see how things changed between each chapter of the textbook.
Beyond this, one of the best things to do is write detailed essay plans. It's good to write full practice essays in timed conditions as well, but planning essays in detail enables you to craft an argument and make sure that you have enough information memorised to help you answer exam questions. If you find that from memory you can create an argument and back it up with facts, then it's a clear indicator that you have a strong understanding of the content, even if you don't remember every piece of information in the textbook.
I'm not sure how much sense this makes but I hope it is somewhat helpful and please ask if you want anything clarifying or if you have any more questions about this
