For comparing differences between the old and new versions of the P.T.C.E.:
For future attempts of passing the P.T.C.E.; I would recommend the following:
The current-version book of Mosby's Review for the P.T.C.E.
Following the current exam's outline:
Utilizing the P.T.C.B.'s official practice tools: https://www.ptcb.org/official-ptcb-practice-tools12
There is a ton of free content online that contain practice questions and too strategies for multiple-choice test-taking and other generalities.