MR.JMSS
Not really. I only used it since I was already confident in my writing and even then it was only to practice a little before the exam. If you do use it, don't worry too much about the mark it gives (rare to get 80%+) and focus on the feedback unless it's telling you to go in more detail. That's useless since you'll only have 30 minutes per piece anyway. It's obviously better to get a teacher to mark your work but unfortunately mine was swarmed with work at the time so I did what I could.
