English competition, I feel that it is enough to do the exam questions over the years. What's the IQ problem behind? Don't worry too much, there aren't many points anyway. And it's pointless to dwell on these issues now.

Band four or six is not difficult. If the English level is ok, you can almost pass the naked test of Band 4. For CET-6, memorizing words and practicing listening should be possible.

No matter what exam, mentality is the most important.

I hope it helps you.