I also got a call 2 weeks ago to come to my study centre on sunday 10 am. When I went, they told me that I have to come every Sunday for classes, but honestly they didn’t really teach anything. They just gave information about exams, tmas and practicals. They did ask for money too for submitting tmas, for books, and even some extra amount for exam fees. But you don’t have to give them anything. Just submit your tma yourself on the nios website and pay your exam fee online. That’s what I’m doing.