Test prep budget? I didn’t know there was such a thing. I wonder how many families can afford something like that. It surprises me that middle- and upper middle income families on CC still complain about the few considerations given to low income families (holistic admissions, need based aid, etc.) when such simple but important advantages are built into their everyday budgets.
I have seen test prep books in the public library. Ours had one set that was several years out-of-date. Even if they were up-to-date I don’t know how much help they’d be to students whose parents don’t have the academic background, time, or energy to help. Work, family responsibilities, and/or health issues can be a lot to overcome on a limited budget.