Hey Gowri, passing the exams is not a hard task, the most important thing is to be relaxed for your exam and read carefully. There will be questions you'll resolve in secs and questions that will take some more time, you have plenty of time, so don't get estressed.
As a simple recommendation, I won't think of going for the exam until you get a 100% on all LA Quiz questions, saving notes for the ones you failed previously and deeply understand them. After that you can go and find some free practice exams on internet if you want.
Also, you don't really need it, but I took one of the AWS Practice exams for every Certification, even though some of the questions would be really familiar to you, there's always the chance to find something you should review before the exam, and well it's only $20, IMHO, it will probably help you, give you some more confidence and well, I think that in value you'll earn more than it costs.
For those Practice Exams, note AWS won't give you the right answer to the questions you have failed so my recomendation is reviewing and saving the questions before submiting the exam so you can verify the wrong answers if any.