The simulation question is a little more difficult than the real question. I suggest you don't do the simulation. The routine of the question is completely different from the real question. You'd better do the real questions, and you can find out the routine of the questions. And you can do more real questions, which makes you feel comfortable when you wait for the exam. Take it easy. Actually, level 4 is very simple. You can take time to look at the questions in CET-6, and then you will find CET-4 very simple. Come on! Must pass!