When knowing this information, my friend chose hkuga instead of GH primary session for her daughter who was in 德幼。One year was exceptionally low, I could remember quite well. You could search in EK. And my another friend whose daughter was among to 30 STILL worried about the risk of promotion to secondary seesion, though she aimed at DGS.
Academic is not the only FACTOR. ALL roundness is of equal importance if not more. Moreover, DBS admits sportsmen and musicians who all excel in other fields and not in academics.
Given DBS with 2.4 and one regional school with 3.x to choose, most will choose DBS.