I am in 9 class and I aspire to crack aiims. How to achieve it?

As a NEET specialist biology teacher, i would recommend you to clear your basics in physics, chemistry and biology because the syllabus of 11th and 12th is detailed extension of the syllabus of 9th and 10th. In  physics work on numerical solving skills under limited time and in chemistry clear all the rules and principles with their application and exceptions. In biology adhere to NCERT and understand every topic line by line. 

As a NEET biology specialist teacher, i would recommend you to clear every concept with patience. Syllabus of 9th and 10th is not much but the concepts are the basis of syllabus of 11th and 12th. Students have a hard time in 11th and 12th because they didn't understood the concepts in highschool , just remembering the definations and laws will be sufficient to pass 9th and 10th classes but it is most important to understand what is the underlying concept in each topic you read. Also syllabus drastically increase in 11th oland 12th which alone is enough for giving you headache. So I'll recommend you start working on concepts as much as you can. Also practice numericals and understand formula application part of physics and chemistry instead of learning random definations. 

Dear Joydip,

I appreciate you vision

Key to success is consistency

You have to first clear the concepts of your own class and make sure to study side by side for AIIMS too...atleast daily an hour.

Focus on maths and science

Try to get concepts clear as much as possible

Try to opt for test series per topic 

Solve MCQs bases on each topic

Consistency and hardwork is needed for excellence 

Explore every topic from different angles to get to know thoroughly that particular subject

Good luck for your dreams dear

Everything is possible

Keep going

If you are going to start early you are surely going to have extra edge over all the other competitors and you would be far ahead of them in this race. You would be the rabbit and they would be the tortoise. Here are the some genuine advice from me -

1.As you are now studying in ninth grade, I would recommend you to join foundation course of Aakash or Allen as this institutes have a well planned schedule for the next 4 years. They have weekly test on a regular basis. It will not only help in your AIIMS preparation but also in your 9th and 10th grade board exams.

2.Buy some foundation books like MTG or DISHA or PEARSON(only physics and chemistry of PEARSON as questions asked in AIIMS are quite tough and require strong concepts).At first you might think that the syllabus is vast but you will sooner get accustomed to it by frequent revisions.

3.Try to enhance your mental ability and question solving ability from the current grade as it will prove to be an important factor in your preparation. Always crave for more knowledgeable.

4. Remember during initial stages of preparation try to solve and read all the reference books you have from the first day of preparation. Don't be lazy and slob and never procastinate your study as it will pile up for tomorrow (speaking from personal experience).

5. As I am in 11 th right now I am too preparing for AIIMS 2020.The only thing we are frightened of during our preparation are the students from foundation courses as they are always trying to steal our All India ranking in test series.

6. Be disciplined and dedicated. Remember success is 99% perspiration and 1% inspiration. The only thing we regret right now is that we should have been disciplined from the first day of preparation as the syllabus is now piling up in front of us.

7. Don't be overconfident during the preparation as it may lead to your loss. Never consider a test underrated and always try to perform in each and every test. Always try to be under AIR 100.

8.Always feel free to ask your teachers if you have any doubt in mind and watch YouTube or Khan academy videos to expand your coverage area.

9.Stay motivated. Watch and subscribe to Sandeep Maheshwari and stay inspired YouTube channels as this will provide pure and eternal inspiration