I don't when it will be administered. I bet MoE doesn't even know. But I think, it will be next year. Anyways, don't get too obsessed. Just prepare just like you prepare for any other exam. Don't spend a lot of time stressing about or studying for this exam. It is not worth it. You may even find the exam a lot easier than you expected. In any case, don't study too much. You will regret it.