From Quora: "How do we prepare for the university entrance exams in this lockdown if we have not purchased books?"

Search for materials online. Many nice people have posted free test review materials, or general educational material in many subjects (see PurpleMath.com, for example). SAT and ACT books are easily available from Amazon.com, Barnes & Noble (.com) for the Kindle and Nook readers (which are free to download to your PC). You can also get paper books from these and other sellers. Also try Half.com, Craigslist, etc. for cheap used books, or even FreeCycle, Rooster, Nextdoor (post and ask if someone has review materials they don’t need).
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You could also hire a private tutor like me [ Tutoring by John Linneball ], and benefit from that tutor’s experience, and probably get materials from that person.