How many questions can you exactly (or, approximately) miss to score a V 45 ?
From what I read, top scorers routinely miss 20% of the questions - is this a fact or a myth?
Well, don't. I repeat DON'T think about leaving ANY question. It is better to attempt remaining questions incorrectly if time runs out, rather than leaving those unattempted. Missing responses demands a higher penalty than incorrect response.
If you are really concerned about the scoring of negative penalty, think of it like this. The penalty on a wrong response is directly proportional to the percentage of questions remaining in the exam. And the negative weight is more on unattempted than incorrect.