The data is really interesting. Of all the possible surveys for study plans, the advisors survey is likely the least biased and most accurate.
I am utterly amazed that despite our going out of business in 2021, we still appear on that list and slightly below the middle. I am actually quite proud to still be on that list. I assume that the people using TBR stuff are using the PDFs or used books for chemistry and physics.
You don't have to break the bank to be ready for this exam. I hope the market for used TBR science books says fertile, so that people can benefit from them and at the same time recoup some of their expenses when selling them.