where in the country are you?
Qualities that I rate are imagination to solve problems and keep ds engaged and motivated if the task on it's own would be dry.
For example, my ds is learning word associations and what goes together. The tutor tried giving him four things i.e. a cow and milk, and a hen and eggs.
DS was really not bothered by the task. Has no interest in animals. So she turned up next time with the 4 things on a kind of maze so that ds would have to navigate his way through tunnels to pair the two pictures.
She had clocked his interest in mazes on a previous ocassion.
Also good observation and analytical skills and a recognition that if the child isn't doing what they are supposed to be, it is the fault of the tutor not of the child, and they are able to look at their own practise to see why it is so boring, unrewarding for the child that they don't engage with the task.
Finally, it is important to keep on top of the admin and data, and to have respect for it, rather than following your own whims about what might be a good idea to teach. You can have ideas, of course, and you can explore them with the child, but to make it a target etc. it needs to be agreed by the parents and/or consultant.
hth