Our budget was $0. Khan academy is free and has plenty of free practice/free exams. We found some other free practice exams on reddit and signed up for Critical Reader’s and the College Board questions of the day. We looked at some other books from the library and others borrowed from friends. But my girls found the free resources were more than sufficient. They preferred to keep things simple. I homeschooled my kids and was always available to answer questions if they had any after taking any practice tests. I can see why some parents who do not feel equipped to help their kids through test prep might want to hire a tutor, though. The cost seems a little insane.