GMAT Strategy

I don't stop thinking about the content of GMAT and syllabus proposed by the exam makers. So far, it has been suggested that GMAT tests only basic math schooled in grades 7-10, no calculus and trigonometry are included. The reading comprehension is part of many standardized tests such as TOEFL, SAT and critical reasoning is one section tested with many graduate admission exams in other countries, e.g. in India- CAT. The truth, however, is that creators of GMAT only make us to believe that nothing special is being tested in exam by omitting the complex subjects, like ones mentioned for math (calculus, trigonometry), and by naming its verbal passage questions as reading comprehension. The truth is that GMAT math is not high school level math. Otherwise why so many math college graduates would fall in love and constantly improve their GMAT sports by tutoring many examinees and posting their solutions on internet forums? Reading comprehension as well as critical reasoning on GMAT are the very special domains of human critical thinking ability. We must be closely familiar with deductive reasoning, and this is possible by our building/obtaining new knowledge based on the comprehended (in the past) concepts. Simultaneously, in exam, we have to approach GMAT RC and CR questions as critical readers, that is we need to repel our prior concepts and still think critically. This is fairly difficult as all our life we used to think critically by applying our prior knowledge and GMAT demands very special skill of critical reading, note please, not critical thinking - but reading. This sort of exam requires our application of brutal knowledge framed with some strategy too. This all makes me to believe again that GMAT is very difficult exam.