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Hi Anjan,
Some of the popular books for NEET/AIIMS preparation are:
For Biology section, please refer to the following books:
Trueman's Biology Vol. 1 & 2
Objective Biology by Dinesh
Pradeep Publications Biology
Prakash Objective Biology
A C Dutta for Botany (Oxford Publication)
GR Bathla Publications for Biology (Theory & Objective)
For physics:
H C Verma for Physics
Aggarwals Concept of Competition Physics for CBSE PMT
NCERT Physics: CBSE PMT by Anil Aggarwal (Set of 3 Volumes)
NCERT- Physics Part 1 & 2
Objective Physics for Medical Entrances Examination (Volume 1 and Volume 2)
For chemistry,
Modern ABC of Chemistry for Class 11th & 12th (Vol. 1 & 2)
Physical Chemistry by O P Tandon
Arihant Organic Chemistry
Dinesh Chemistry
Concise Inorganic Chemistry by J.D. Lee for Inorganic Chemistry
Objective NCERT at your fingertips Chemistry by MTG
Additionally, for AIIMS exam:
For GK section:
You also need to stay abreast of the latest happenings for the GK section of the exam. To achieve this, you must diligently read newspapers, subscribe to a weekly or monthly current affairs magazine and pay attention to the science section.
And last but not the least, also refer to previous years question papers from the following sources:
Arihant AIIMS MBBS Entrance Examination (Solved Papers 2008-2016).
MTG AIIMS Explorer (17 Years Solved Papers) by Dr. Sandeep Ahlawat.
AIIMS 17 years solved papers by Disha Publication.

Student Pilot License (SPL) & Private Pilot License (PPL) are intermediate stages of Commercial Pilot License Training.
You will be issued an SPL by the flying club after some hours of ground classes and an internal exam. Thereafter you shall become eligible to start flying training.
Its very simple logic SPL - PPL - CPL.
YOU CAN SKIP PPL AS IN ANY CASE YOU ARE ASPIRING FOR A HIGHER LICENSE, WHICH WILL ALLOW YOU MORE PRIVILEGES THAN PPL.
For becoming a commercial pilot, there is a specific eligibility criteria, which you should first be aware of. This is decided on what subjects have you taken in class 12th. It requires PCM to be a pilot. And, even if you have not opted for the same, then you can appear separately for these subjects and become eligible. Further, you should be aware that you are medically fit to be a pilot, so I would suggest you to visithttp://www.dgca.nic.in/medical/medical-ind.htmandgototheclass 2nd examiners tab to find out doctors who will examine you for initial fitness. You can visit any doctorate from the list as per your convenience. Once you are done with Class 2nd medical, find out a suitable flying club for you as per your convenience. You can fly in India or abroad. I would suggest you fly in India. Besides finding the club, be aware that you will have to appear for:
1. Air Navigation
2. Aviation Meteorology
3. Air Regulations
4. Aviation Technical
5. Aircraft Specific
6. Radio Telephony
Here, 1-5 are conducted by DGCA and 6 is conducted by WPC. Prepare for these subjects and appear, as exams are conducted every quarterly. For preparation, flying club will help you or there are private instructors available in metro cities as well. You will fly for 200Hrs + Clear DGCA and WPC exams + Clear Class 1st medical, then you shall get your CPL. The next license is ATPL, which you shall be able to apply for once. You will then have to probably fund or self-sponsor your type rating on whatever fleet you are selected in an airline. Then, you finally get a job as a pilot. I hope the process is well explained to you. CPL is an expensive affair. It might cost you around Rs.18-20 Lacs for flying + DGCA exams Rs.500/- each exam + Medicals for Rs.10, 000 + endorsements and license issue fees around Rs.25k + Type Rating around Rs.15 Lacs. So, decide wisely before you enter the field.