As a prerequisite for the application of an Indefinite Leave to Remain or Settlement in the UK, the foremost thing that you have to do is take the British Citizenship or the Life in the UK Test. Successful test results, along with the Application for Citizenship will then be passed to the Home Office for perusal. But of course, you have to hurdle the task of passing with flying colors before you can attempt to apply.
The British Citizenship Test consists of 24 questions and you are expected to answer about 18 of it to be able to receive a pass notification letter from the Test Center. Afterwhich, you can attach your results notification letter to your application and pass it. However, you cannot submit the application unless you obtain a 75% passing rate in the exam, or simply put, you cannot apply for citizenship if you fail it. Therefore, you have to make sure you will try your best to make the most out of it. Here are some of the things that you will need if you do plan to take the test soon:

1. Read the Life in the UK Handbook. There is only one book that can help you prepare for your examination, and that is the 2nd Edition of Life In the UK: A Journey to Citizenship. As suggested by many, the Chapters 2,3,4,5 and 6 are where most of the questions are taken from.
2. Book a Test. There are many Test Centres all over UK that administer this examination. Find the one nearest to you, or the one you deem convenient for your examination. Pay the ?35 Fee, and wait for the examination date. Commonly, it takes from 1-4 weeks to be given a schedule after application.
3. Do practice tests online. There are Citizenship practice tests online that will prepare you for it. In addition, you may consider practicing your computer proficiency if you are not so adept with it, since the examination will be computer-based.

The success of this test determines your eligibility to obtain British Citizenship, hence, it should be taken seriously. Read the book and study well.