You didn't post which exam simulator you're using (or if it's paper based), but for the prepcast PMP Exam Simulator the rule of thumb is a score of 85% indicating "readiness."
You're getting close. Personally, I would probably carefully examine which types of questions you're not getting right, and study/retest a bit more.
I am looking for input if I am ready to take my exam next week . Here is my performance
Test 1 : 79% : AT,AT,AT,AT,AT
Test 2 76% : AT,AT,T,T ,T
Test 3: 73.5% : T,T,AT,T,AT
Test 4: 71% : T,T,AT,T,T
Test5 : 71%: T,BT,BT,AT,BT
Test 6: 67% : T,T,T,BT,AT
Test 7:74% : AT,T,T,T,AT
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