I found possibly following errors in the book “OCP Java SE 11 Developer Practice tests” from Scott Selikoff and Jeanne Boyarsky.
Since Jeanne is active in this forum I try to give the feedback here.
1) Page 21 question 18
Question says “Choose two” but the answer contains three options A,D and F
2) Page 47 question 50
Answers are B and D
But E should also be correct because three classes do compile: Leader, Follower and Dancer.
3) Page 57 question 74
“How lines of the following code do not compile?” The word “many” is missing
4) Page 119 question 213
Answer “E” should be wrong because the private method process() of the Michael interface is NOT visible in the Twins class