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One or two weeks before exam date start to create a situation as if you are under exam condition!
How?!
I'll tell you!
For reading and listening skills prepare Sample sheets like those on the picture above and time yourself just like exam condition.
For writing time yourself again and write on specific papers.
(please note that you should write every other line with a legible handwriting and raise your hand when you run out paper!why?because like exam condition you undoubtedly will run out paper and ask supervisors to bring you extra paper. Don't worry they do that otherwise they will be punished by ielts.org!)
Last but not least, for speaking test choose a topic and start to tell about that by a loud voice.
Good luck…