Hello Terry,
Like everything the short answer is practice! But you do need to know which level of IELTS you are aiming for and then you can look at sample answers in the IELTS handbook where you will also find the marking rubric.
Hope this helps
Bob
1 กันยายน 2015
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good question ,, i need to know too
1 กันยายน 2015
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You should say what level are you preparing for (i.e. desired bandscore), because, I believe, it really depends.