<p>No, I don't agree. I think you should first skip those questions you are unsure about.
When you answered all those 100 %- questions, then return to them and try to eliminate as many answer choices as possible. Given you eliminate the "wrong choices", you should have a fairly good chances picking the right option. The possibility that you eliminate the actual right one; shouldn't be so high! If it is, you should consider what you're doing wrong.</p>
<p>I have the same book...it also says to skip questions you don't know the answer to until you've finished the ones you do know...then go back and try to solve. If you can eliminate at least one answer and aren't totally clueless on the others, then guess. If you can't make an educated guess, then leave it blank.</p>