I don't think this helps you but when I did the residential ATPL groundschool several years ago, I managed to persuade my local council that I was a full-time student. I didn't pay any Council Tax whatsoever for 6 months. I had to prove that I'd enrolled on a course of full-time study which lasted at least 6 months. I only just met the 6 month criterion by using the groundschool start date and the date of the last exam to calculate the overall duration.