Hi Benni.

The short answer is that you won't really get from a book or from someone else all that you need in order to achieve a high RC hit rate, because what you need to do in order to achieve that hit rate is develop your vision and your skill at understanding what's going on in the passages.

To develop your vision and skills, you have to work on RC practice questions very slowly and carefully, seeking to understand the logic of what's going on in the passages, what exactly the passages say and do not say and why each wrong answer choice is wrong and each right answer choice is right.

Many RC questions are designed in such a way as to capture just what the test taker thinks the passage said, which is not what the passage actually said, and you have to become good at noticing the difference.

Another aspect to RC success is refining your process for achieving understanding of each aspect of the questions. Your process for handling RC questions needs to be tight and effective, and, as Brent said, what process is best depends on how you work best.