Well Princess Beatrice seems to be the brain of the crew 2 A*, and 2 A is pretty respectable.
As with elite US schools as pointed out above, the situation for legacies/celebrities is different now than it used to be. I’m quite sure Malia for example had qualifications that surpassed GW Bush’s and that put her in Ivy striking distance and the celeb/legacy factor just helped rather than letting her in without qualifications to begin with.