Below links are a worth of reading before preparing IELTS

[IELTS로 미국가기] IELTS Average 6. Never be Difficult!

What should a well-organized essay be like?

There are no exact rules or formats to a proper essay. You must remember that. This is a big problem for many students (globally). Many people do not realize that you can say the same paragraph 100 ways. They feel they have to find the perfect vocabulary, perfect supporting details and examples, and a specific sentence/essay structure. However, you can be quite flexible with this. Be creative.
 
The most important thing to keep in mind is BALANCE. Don’t put too much information in and don’t leave important information out. For each point you make, you should give one or 2 details and one good example. If you only have one example in the essay, that’s fine. Don’t put more than 3.
Use smooth transitions to make your essay flow properly. A reader should never feel like they are jumping from one point to the next or one paragraph to the next. Everything should be connected.
You should have a strong introduction and conclusion (not boring). Don’t be too repetitive! Ignore what your middle school and high school teachers taught you about repeating the question sentence exactly in your introduction. Also, don’t repeat the exact same words in your conclusion. You can same the same thing, using different words. While your introduction should be attention-grabbing, your conclusion should have obvious, general statements. NEVER add new information in the conclusion.   
잘 쓰여진 에세이라는 건 어떤 건가요?
에세이를 작성하는데 정해진 규율은 없다는 걸 명심해야 합니다. 사실 많은 학생들이 에세이의 형식에 얽매여서 어려움을 겪고 있는데, 가장 잘 쓰여진 에세이라 함은3개 이내의 예시가 들어간 에세이라고 할 수 있습니다. 또한 에세이는 그 내용이 상관성이 있어야 하고, 마무리 단계에서는 반복을 피하되 읽는이로하여금 전달하고자 하는 메시지가 명확하고 강하게 전달되게끔 맺음 짓는 것이 좋은 에세이의 관건이라고 할 수 있습니다.



출처 - http://blog.ieltstest.or.kr/660