The best way to prepare for IELTS is to start by making sure that your general level of English is at Intermediate (B1) level. It is important to remember that IELTS is a test of English in English: so, the first thing to do is to have a good foundation in General English.
Once you have this good foundation, then you can begin to think about joining an IELTS preparation course. On this type of course, you will benefit from experts who will help you to develop the skills in Listening, Reading, Writing and Speaking that you need in order to get a good score in the exam. As well as practising the skills needed, you will also get exam practice and tips on how to do well in the different parts of the exams.
Another very important part of the course is continuing to develop your language so that your general English does not get stuck at B1 level. Expert teachers can help you to focus on building your vocabulary and improving your grammar so that your language continues to develop. Remember IELTS scores can be translated to Common European Framework (CEF) scores so that if you are a B1 it is very unlikely that you will get more than 5.5 in IELTS. If you need to get a 6 or 6.5, you need to have a B2 level of English. If you want to score 7 or more, then your English needs to be at C1 level.
To achieve the big improvement in your English necessary to improve in this way, you need to join a good IELTS course. On a good IELTS course, an expert teacher will know how to balance the right amount of time on exam skills and language development. On a good IELTS course, the teacher will give you detailed feedback on your writing and speaking and practical suggestions on how to improve them. They will also select listening and reading materials which are both interesting and useful in terms of improving your skills.
Joining a course and participating in it and working hard are all necessary and very important. However, there are other things which you will need to do. A good IELTS course will help to advise you what these other things are and provide support and materials to help you do them. In order to improve quickly and enough, it is necessary to do a lot of work outside the class. This includes doing a lot of reading, practising listening to authentic materials and doing more writing than you can do in class.
A good IELTS course will give you a programme to structure your time so that you can do extra work on these important skills. It will also provide you with information on where you can get materials from. The teachers will help you with any problems you face when doing self-study. Finally, a good IELTS course will also have a tutorial system so that the teacher can give you individual feedback about your progress and help you with any questions you have.
In short, the best way to prepare for IELTS is to have a good foundation, at least B1 level, in general English. After that, you will need to join a good IELTS course and accept that to make serious progress, you have to work very hard on the course and do a lot of extra work. Of course, the best place to do this is in the UK or other English-speaking country where your English will improve more quickly as you are living in an English speaking environment all day long!!!