Kedar91
Out of 64 que in GMAT, how many wrong ans are allowed to get a score of 705+ ?
Given the adaptive nature of GMAT, your question may not have a straight forward answer. It might be more useful to look at it at the individual section level.
You probably need 255 points in the sum of three section scores to reach 705, which is 14 points more from your current mock score. Consider your own strengths/weaknesses and therefore from which section(s) these 14 points increase can be more efficiently achieved.
Also, the tolerance for number of wrongs is different across sections. This is the level where you look at other score reports and figure out how many question you might get wrong but still achieve the section score you need.