Intelligence tests

The secondary school admissions process in England is still too complex for many parents, research claims.
…
"Despite improvements, our research suggests that the system is still too complex, particularly for parents and carers who are not highly educated or proficient in English, and especially where there are schools responsible for their own admissions," says report author, Anne West.

Well, why go to the effort of marking all those 11-plus exams to select bright kids when you can just use administrative complexity to select bright parents? As long as it runs in the family, you’re laughing.