Wise guessing is very advantageous for IELTS candidates. Unlike a few standardised tests, NO penalty considered for getting an answer incorrectly in the IELTS exam. Even if you have no idea about a question, you still have around 20%-33% chance of getting it right. Most IELTS candidates do not understand the impact proper guessing can have on their success in the IELTS exam. Unless you score extremely high, guessing will significantly contribute to your final score.

Consider not answering a few questions either in your reading or listening test and scoring nothing for those questions versus guessing their answers wisely and making a few of them correct. This will certainly have an impact on your band score.