I'm the Mum of 2 boys who went to HABS and a daughter who is still at the Girl's School (In fact I went to the Girls and my 2 brothers went to the Boy's School.)
I was certain that HABS wouldn't take anyone who hadn't taken the exam but I wanted to check. I've talked with a senior person at the Boy's School, and he was absolutely insistent that no boy is ever admitted without participating in the full examinations and interview process, and that the decision to make an offer is based entirely on demonstrated academic ability. He assured me that the wealth or status of parents plays absolutely no role in this process