english sac help

I'm freaking out we have our first sac in 5 days and I'm so confused. When I look at the topic i get so overwhelmed I can't think of 3 reasons and if I do think of reasons its about 1 character for each paragraph. I read the film guides and the english lab notes I feel like it goes in one ear and out the other no matter how many times I reread sample essays, film guides, notes. I tried memorising but some people are saying it's useless..what do I even memorise? how do i find the 'core essay' 'core paragraphs' i even rewatched the film and I still can't think of ideas or linking the symbolisms and film techniques and stuff to answer the question. How do I approach studying for english besides doing practice essays and stuff. Where do I start? I'm doing Sunset Boulevard btw