I passed the OCPJP 8 Upgrade exam with 100%. My preparation took nearly 3 months, which I took very seriously. I used the following resources:
-Java 8 In Action (This book is really useful, I recommend it for every candidate)
-Enthuware mock exam software (it helped me a lot, just like earlier when I faced the OCAJP7 and OCPJP7 exams)
During the preparation, my enthuware standard test scores were the following:
-Standard Test I. 64%
-Standard Test I. 81% (One week later I repeated the first exam without checking the right answers after the first attempt)
-Standard Test II. 85%
The actual exam itself is usually easier than these enthuware mock exams, so that was a good sign and I was confident. The real exam took me 2,5 hours, I had enough time to check my answers over again before I was finished.
When I saw the results later that day I almost couldn't believe my eyes, I aced the 1z0-810 test.
My next step is to sharpen my Spring and Spring Boot skills, and read a few new books about Software Engineering.