A research team from the University of Essex has conducted research into the Life in the UK Test. They had 270 people, most of them UK citizens, take a test based on the Life in the UK Test. The result was that 66% per cent failed the test.
This goes to show that if you plan to take the Life in the UK Test you need to be fully prepared. You need to have fully read the study materials and have taken practice tests to check that you have learned the materials and are ready to take the official test.
If you would like to know more about the University of Essex research there is more detail in the article linked below: