I took exam CGEIT in June/2018 on CBT and received the preliminary result is fail 

. Although, I qualified CISA with 515 points and know ISACA question.
For study CGEIT process below:
- Read the review manual (read 3 times and take note the main content)
- Read the Questions, Answers & Explanations (read 2 times and learned all the wrong answer)
- Read more questions in bank test
- Learned the summary content for CGEIT slide 

--> For post test, i made sure all question is 95% before the exams
For taking exam CGEIT:
I found that the question in exam is more complex than the book question. Some questions is like the way to solve the problem in HR management. 

I am confused the whether to take the exam next time or not 

 Because i think i am fail due to lack of actual experience 

Do you have any way to improve my knowledge 

By the way, is there any chance to pass exam even received the preliminary result is fail ? Because i knew that there is scale points for each exam.