These mistakes can stop you getting Band 7 or more.
In my experience when teaching IELTS writing classes, I noticed a lot of my students making at least one or two or more of these mistakes. The IELTS examiners are marking your paper based on an official IELTS marking criteria so there is no guesswork here.
See below about the 10 most common problems students have when dealing with IELTS Writing task 2 essays.