I won’t be reading the old readings, however, I’ll do the same readings from 2017 books. I will try to study the new readings from Bookshelf, I don’t like reading from PDF files too much, buy I will give it a try. That’s why i was asking about the possibility of buying the printed books later, just in case I didn;t get along with PDF files…
You can buy them at anytime from the CFAI website. I originally was using Schweser only and then 2 months before the exam I decided I wanted hard copies of the books and bought them.