Many people who want to either learn English from scratch or brush up their existing language skills choose to do an immersion course for the maximum results. There are many English schools in Cork in the Republic of Ireland and these are a popular choice with foreign students.
The benefits of an immersion course are multiple. They produce far better results than regular lessons in the pupil's home country as the pupil is literally immersed in the language. They speak English all day at school and in the evening with their host family. They even have to speak English if they want to take a bus or buy a sandwich in a cafe, so their English skills are perfected much faster.
They also get to learn more about the foreign culture of the place where they are staying and so they learn not just the language but start to understand the people, the customs and the traditions of the country.
It may seem like being thrown in at the deep end but this is really the way to learn English quickly and well.
Cork is an ideal place to learn English as Ireland is a beautiful country which can be explored in evenings and at the weekends. Plus, of course, the people are famously friendly in Ireland so they will be welcomed with open arms.