Thank you all:)
Viktor, your comment reminded me
Stephen Kings Quitters Inc short story
I can tell you my path for the upgrade exam:
1-I have checked first: which chapters I need to follow from Jeanne book (2,3,4,5,6,7,9,Appendix C)
2-One day I did a quick read for all chapters to have an idea about what I don`t know, i noted name of the topics/methods which I found hard so I can revisit
3-Following 4 day I re-read book, I just visit 2 chapter per day, opened API in one browser and eclipse.Then created package per chapter and wrote
unit test classes for important topics (i.e. StreamTest, OptionalTest, ForkJoinTest etc...) took notes about things/chapters again I want to re-visit
4-After I finish the book, I visit coderanch and found each 1z0-813 certfication result topic, add each java class/method name mentioned in it to my checklist
5-Next week I went through my checklist re-visit as a flashcard if i can explain remember method names and usages. Also I check Oracle website and Jeanna books errata table if something new
6-There was total 6 test for the Enthuware so rest of the week I took a rest and complete exams, I just finish one exam in 2 hour with 75% I divided other exams by 30 question. For divided tests I get average 22 correct answer
7-Last day (4 hour before exam) I went through all my wrong answers through Enthuware (my exam was 12:45)