What is the US citizenship exam for?

After you apply for US citizenship part of process is the citizenship test. It is to test if applicant is worth the citizenship.For the civics test there are 100 questions. Applicants are asked during the interview 10 out of the 100 and you need to get 6 of them right to pass the test. Two opportunities are give nto each applicant.If they fail retest should be taken up within 90 days on the portion in which they failed either civics or English.