When you plan to go to the UK or even stay there, you must have a visa first. For immigration visa, you can take the English language test first at britishlifeskills.com. Make sure that you choose the right schedule there and the categories that are right for your needs.
All you need to avoid making this visa is a damaged passport. Make sure that the passport you bring and show to the officer is a good passport and is still in good condition.
Not only passports that are invalid or damaged will make your visa application process rejected. If the validity period of your passport has also been less than six months, it is likely that your visa application will be refused. Therefore, always pay attention to the validity period of your passport and make an extension before the six-month period approaches. So, make sure in advance that the passport can still be used and there is no damage to it.