More Primary Three pupils sat a revised citywide school assessment this year, according to a teachers’ union, although the children appeared to have found the tests less stressful than before.The Professional Teachers’ Union (PTU) surveyed 401 teachers and 395 schools in May.Of these, 234 schools said they made all their Primary Three pupils sit the controversial Territory-wide System Assessment, compared with 201 schools in 2018.All government-funded schools must join the assessment but can…