How to get 7 in IELTS speaking

I suppose preparation is of the utmost importance, because maybe not many people have such quick mind that they could make up a 2-minute story with a wide range of grammar and advanced vocabulary.

Several tips:
1. Try to be as fluent as possible but at the same try to be natural. If you really recite your answer so well that you can speak it without break, try to pretend that sometimes you are thinking and have natural pauses. 
But if our mind suddenly goes blank, like forgetting what we've remembered, and there is a long time (say 3-4 seconds) silence, try to not be panic, clam down find whatever you could remember to proceed the topic. It happened to me, but I still got 7 in speaking for that test.

2. Do not always use simple sentence, but use a wide range of grammar structure and vocabulary resource. If time is enough, it would be very helpful to look up a word in the dictionary to see whether how we use it is accurate or not. For example, usually I say "xxx leads to crime", but in dictionary it says "xxx breeds crime". 

3. Try to use different tenses in different situations, such as past tense, perfect tense etc.

4. Try to be detailed rather than general.