Now that you are in the United Kingdom you need to pass the final test as part of your application for British citizenship or settlement in the UK. You will have to book your Life in the UK Test online at least 3 days in advance. It costs £50.
There are about 60 test Life in the UK centres in the UK . You will need to choose one of the 5 closest to where you live. Note that you have to bring proof of your address to the test. If it is not the closest you cannot take the test and you will not be refunded. You will have a total of 45 minutes to answer 24 questions about British traditions and customs.