Looking for a English courses

I will soon go to Ireland, I will work here. I want to learn English here to improve my level. Can you recommend where to search good schools?

Try to search on Ireland forums maybe. In what city you will work?

Here is good course aggregator for you https://linguatrip.com/en/english/ireland/ they provide better prices than in schools. Irish education, including English language courses, is considered one of the best in Europe, as good as British, but not that expensive. So it is good variant for you.