oh, i failed too - 14/24.
some of the questions are badly phrased and factually incorrect -
eg - for a problem with your employer, you can go for help to all four of the listed places (Citizens advice, employer, MP, ACAS.) They list CAB and ACAS only, in actual fact the first place to start in most cases would be the employer.
census information is available when they process it (which takes years) - the private part of that information may be kept secret, but the generic results are made available.