Based on the books and test banks I have seen on the internet (to include Kaplan and the all-in-one books), most of them have practice questions that line up with the 2015 version of the test. The new version of the test is much more in line with CISSP style questions. There is a second edition study guide now that was published in April 2019 by Mark Wills, but I have seen mixed reviews on it online. I will say the review questions are much more similar to what you will see on the test though.
I highly recommend avoiding the Mike Wills book it's terrible. What I do recommend is the All-in-One Third Edition by Darril Gibson, and the Offical Practice Tests First edition by Mike Chapple.
Please could you explain this point more in detail?
Do you mean that SSCP exam questions are "more wordy" and difficult in the current version of the exam than in the Official Practice Tests, All-in-One (Third Edition), etc?
What I have seen so far is that review questions included in the last version of the Study Guide are much more difficult and confusing than in any other materials I have seen so far...
Please could you give me more details about this? What do you mean by "different"? Do you mean "more wordy" and less straightforward?
Don't worry about this; just make sure you understand the material, and during the exam, synthesize and apply the knowledge you've learned.