You have enough time to be well prepared for the exam. I would suggest you to go through well with NCERT books as it will help you to clear your basics to cover the syllabus. Here are some of the important tips you can follow for NEET & AIIMS preparation without coaching.

Make time Schedule: Make a time schedule subject wise & topic wise, It will help you to clear your syllabus.
Follow subject tricks : See the trend of NEET past year papers. While solving questions, apply the tricks & Practice a lot and learn from your mistakes.

Make your notes : Making notes is very beneficial in your preparation. Make your own notes,The notes will be handy during revision. Include your own shortcuts and tricks.

Revision : Revision not in last few months, but every day. Go through all the things you learned during the day.

Good Luck!

Hello,

For cracking neet exam its best to start prepration from ncert books of 11th and 12th and after that solve last 5 years question papers. Apart from this you can also join coaching and study from the material which they provides you.

All the best. Work hard.