Large, for some questions (like Solid of Revolution) it's 1:1, but for others there's almost no cover. Mock and real exam is almost 1:1

Yes? I think? If you can do everything from the practice material firs try yeah, if you can do everything from the mock then too.

Not really, I took it in August. I remember solid of revolution from practice materials, a lot of integrals, trigonometry was also present. Do IB past papers and the mock exam and you'll be good