We came 24th at DAO with scores of 140 for VR, 92% for maths and 64% for English (comparable to practice papers). A couple of marks less would have placed us 10 places lower suggesting marks are all very close. Scores of 125 for VR, 75% maths and 64% for English didn't even get you within a sniff of the reserve list. This will change each year with the cohort. We live in the London Borough of Barnet which puts you at a disadvantage as at least half the selective children have to come from Herts. This is last years thread on the topic which may be of some use to you.
Don't know about HBS as I have a boy. They don't give out scores but I'm sure somebody who gained entry will be able to give you ideas as to how their children did in practice papers.