Well, only those persons should prepare for IELTS who don't have full command on ENGLISH otherwise no need to waste ur time and money.
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You will be provided pencil,rubber & sharpner
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The tricky part is only HEARING only as u will hear conversation and during conversation you have to search for answer and note down in your answer sheet. You will get few minutes to see your question paper before commencing to next stage.
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Very easy as i got 6.5 BANDS without having any preparation at all.

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"A winner listens, a loser just waits untill it is their turn to talk"