is real GMAT or Kaplan tougher?

In my experience, both are the different. Frankly, it's hard to say which one is more tougher than the other one. I think GMAT is designed to test your verbal and math ability in English. Based on this point. I think you should focus on developing verbal and math ability by reading a lot articles in magazine or newspaper everyday and reviewing the basic concept of math in high school. If you have a high level in English, you'll get the high score easily. Otherwise, you'll be hard to defeat GMAT test. Maybre, being a student for me in Taiwan, in Asia, thinks that math section is pretty easy to control. But, for verbal section, it has ever been my nightmare. So, when I prepared GMAT, I almost spent a lot time on reading a lot articles in magazine, such as economist, businessweek, new york time. and U.S news......
After, I really improved my reading speed and reading comprehension.
It's my experience.