I study PMBOK 1 time, RITA exam prep 1 time

Whizlab 800 question, all get 70-80% ,but i did it few times each, so i answer the question from memorize.

I join Linkedin "I want to be PMP" group and answer about 50 question from the members's discussion.

This week, i do 2 time RITA Fast track,the PMP exam,

I just got about 55% to 60% result, which is fail...

I saw some PMP holder said real PMP exam is more harder than RITA Fast Track.

I have no direction what can i do to fill my knowledge gap.