If you would like to start with simple books, try teenage romance books. They're incredibly cheesy but have quite a large range of vocab usually. If that isn't your thing I would suggest reading books from movies you enjoy. If you aren't an avid reader then avoid older books like Lord of the Rings or anything by Austen ect. They are better for advanced readers. Oddly enough, Tiktok is very good for recommending simple books that are easy to read. Some ive read like The Song of Achilles and The Seven Husbands of Evelyn Hugo were excellent to read and had a larger range of vocab than I expected. I hope this helps :)
i can't recommend murakami as an author enough for people who aren't really avid readers. he has an amazing ability to keep you engaged so his works aren't difficult to read. madeleine miller also has incredible books and she uses an extensive amount of vocabulary in her books.
poetry is probably your best bet if you want to broaden your vocab without much reading. a lot of it is online too so you can get a preview before buying any of the works. schools teach us to interpret poetry in a universal way instead of us doing it on our own which is what puts some people off, so if you think you wouldn't like poetry, still give it a shot. benedict smith is great, edgar allan poe and sylvia plath are also good. when you get more into poetry, read rainer maria rilke's works.
once you start getting more into reading, move onto classics. they really will give you an upperhand regarding language. examiners will also love you in paper 1 if you quote a classic author to make whatever you're on about sound nicer.
Wuthering Heights, 100 times over. Great Expectations, also. They are two of my favourite books of all time. I understand that they're classics and that some people find that hard to digest, but please give those two in particular a try. The improvement they bring to your writing style overall, and verbal expression in general is amazing. Anything written by Agatha Christie I also love; her books really show great ways to construct a story, if you're interested in that sort of thing :grinning:
Arthur Conan Doyle writes well. Odyssey and Illiad translations have good vocabulary. Crime and Punishment by Dostoevsky is probably my favourite novel and the language is beautiful. The Idiot by the same author is great too. Nitezsche's Thus Spoke Zarathustra is written beautifully- although it's a German translation the vocabulary is wonderful. Sartre's Nausea also have detailed descriptions of ordinary things which contain brilliant vocab. I think anything from the 1800s although trickier for the modern reader contains much richer vocabulary than most of what you'd read today.