Yes, it is possible to pass english with out reading/watching the texts. (Fig. 1; me)
Pass though. You're not going to do brilliantly. (Fig. 2; me)
You're not going to get a great mark by not reading the texts. If you read enough other material to feel confident, IMHO it would've been easier to just read the book. I get Frankenstein might not be everyones favourite cup of tea, but at least read some of it. BR/Frankenstein is a popular unit, so lots of people do it, and it will be obvious to differentiate between those who did and those who didn't read the book. It's not that bad of a book. It definitely does get better as the book goes on.
Especially when the HSC writers decide to be an ass and ask questions that you would only be able to answer had you read the text (paper 2 module B fuck you)
TLDR
english counts, no matter what and reading the books/texts will help