There are 80 billion threads on this; if you search, you'll probably find a ton of answers/advice/suggestions.
And FWIW, don't read or study anything before 1L. If you want to read, read fiction or non-fiction that you're interested in personally, as you won't have time for pleasurable reading in a long time once law school starts. If you must read something law related, try something about the Supreme Court, which can be interesting and not related to substantive coursework. Prepping is not worth your time or effort - you'll be burned out enough as it is in 10 months if you start school in September. There's no need to start early.