OP specifically says not being able to buy the course before the 21st. This means that OP will not have access to the pdfs which is a huge part of the value of this course. I don't think it's fair to call that point moot.

I think that properly and accurately solving Necessary Assumption questions requires the negation test. Before applying the negation test, some answer choices seem attractive because they match with what could be true. But we don't know if it is merely a proposition that could be true or a proposition that must be true. And that, I feel, is the hardest part about these questions.

@ that's a pretty big logical leap, if y'know what i'm sayin'. And I mean, you already have access to the website. There's no reason to need a way to download it.

I think that leisure reading outside of the context of the LSAT is only marginally helpful. I mean, it's great to get the mind into text-processing mode, but the text on the exam is much more dense and so requires a great deal more effort.

As for getting faster, I think it comes down to getting better at being able to organize information in your head in terms of hierarchy. One sentence in a paragraph probably has the main idea, while the rest are more like supporting details. Getting faster requires being able to prioritize information efficiently. At least, that's how I see it.

I also want to add that I am asking this primarily because some answer choices seem very intentionally complex and weird. Like, I am unable to figure out its relation to the argument. And that might be because it is indeed irrelevant, but that sort of lack of clarity and lack of confidence tends to drag me down in terms of timing.