If you speak English on daily basis, then getting a good band in IELTS test is no big deal. There are four sections in this test : Writing, Speaking, Listening and Reading. Speaking is just one to one interview. They will ask few follow up questions based on assigned topic. Be confident because it will be easy to score well if you don't use fillers or take a pause for more than 3 seconds. You can also watch youtube videos or take some online practice tests which helps you to know where you stand and these will also help you to improve your weak areas. Try tcyonline, quora for more preparation material.