Should I buy the newest SAT Subject Test books, or are older ones fine?

Hey!

My friend handed down to me Biology and US History subject test practive books by Barron’s. Both are not the newest edition; they are from 2015/2016. Should I buy new books?

I looked around the internet and there were no mentions of the tests changing in the past several years, so should I be fine content and structure-wise if I practice from the older books?

Thank you!

I think your books will be fine. I have not heard of any significant changes in subject tests. Others might have a different view. You can always ask your subject teachers at school for their input.

You’re fine with those editions.