It is definitely necessary to have clear ideas about common error patterns before doing the evaluation. Also, when the student speaks very quickly, it is absolutely necessary to be able to go back and listen again.
I can clearly see how the three subtests are effective and in this order.
The error table is a good tool to summarize errors by category. I also expect that with more exposure and practice handling the subtests, the time to summarize the errors gets easier.
Very thorough procedure.