hello there ... i understand your point.
but let me correct: i know, the meaning of "reading" is too superficial, yet i did not mean that. SC is not a fiction book to read, i know. i actually went through each chapter, each concept, analysing each and every problem , rule and explanation. The same with OG. i never missed my problems w/o analyzing them first. i was always reviewing my mistakes(and not only mistakes, even correct ones,), why i did the miskate, what i did wrong, etc .... sometimes it took even hours to analyze the problem till i got the real thing. but after doing OG i still think that OG grammer is really easy compared to that of the Gmat Prep. Not a single problem (especially from OG ) i let go w/o thorough comprehending ... but still they seem rather easy for me ...
it would be great to find somth. a lot more
challenging to practice until the real test . but i dont know material that would reflect the the real SC tested.

((