Textbook: Focus on Earth Science
You can get a PDF version of the textbook here:
https://drive.google.com/file/d/1pqDUOZLCTDTvQIulOUnYp_rLHLQA2mA8/view?usp=sharing
or here (with sidebar table of contents): https://www.pusd.us/cms/lib/CA01901115/Centricity/Domain/432/Science/6th_grade_science_Book.pdf
You can find a LOT of wonderful "Quizlets" online (flashcards, quizzes, fill in the blanks, matching, and more) here:
https://quizlet.com/subject/CPO-Focus-on-Earth-Science/
Just click on the chapter/topic you want to prepare for and choose which type of study game/help you would like!