Hello Pravin,

I would like to tell you that your hardwork decides your success. If youwork  hard in 3 months, you may acheive AIR 1.

Here are some tips for you which will help you score good in JEE ADVANCED mentioned by careers360:

• Start as early as possible. Don’t wait till the end. Starting early will give you more time for your revision.
• Before proceeding, make your study plan. What need to be covered first, what are the topics that need more focus etc should be answered while preparing the study plan. Divide the plan in such way that equally time is given to all the subjects and your also left with the time for revision.      
• Authorities will provide mock test of JEE Advanced 2019 for all the eligible candidates. Attempting mock test will enable you to know your preparation level. Not only this candidates will be able to familiarize with JEE Advanced 2019 exam format (CBT). The mock is the replica of the actual exam, so it will also enable them to learn time management.
• Solve previous year sample paper of JEE Advanced- To boost the preparation level, solving previous sample papers is the right way to go about. JEE Advanced sample papers will enable candidates to get and idea about the questions that can be asked, section-wise weightage and more.
• Stay positive- Take the right amount of pressure. We know that JEE Advanced 2019 is big and pressure of performing is bigger. Still, don’t take unnecessary pressure. Stay positive. Don’t allow negative vibes effect you. Cracking the entrance exam is not life and death situation, it’s just an exam. So be positive and take right pressure.
• Don’t just keep on studying. Take small breaks, go for walks, movies or chit chat with your friends. However, ensure that everything you are doing is to rejuvenate yourself, don’t forget studying is your priority right now.

I would suggest you to visit the careers360's link given below which has a detailed explanation of the JEE ADVANCED and the important books, and other tips.

The link for the same is:https://engineering.careers360.com/articles/jee-advanced-2019

Hope this helps and all the very best!