I studied at Thammasat (4th year) and, yes, it’s like any other university (homework, assignments, team projects, etc).
The students complained how difficult it was, I just thought oh come to Canada and you’ll experience difficult. But it was the same during my studies in Canada where students complained and I thought oh come to Germany and you’ll experience difficult.
So, no, studying in Thailand is not difficult. I got As with minimum effort and B+/Bs without any effort.