What is the best way to prepare AR Questions in physic and chemistry for Aiims?

Hey Ganesh !
Well, the easiest answer to solve your query is :
"Literally eat up the entire NCERT book of Phy and Chem".
The A&R Qs. in AIIMS often are put from direct lines in the NCERT books.
Apart from clearing up your concepts in the chapters, one thing you must remember is that
Never ever prioritize the chapters especially in AIIMS.
It's such an exam where Qs. pop out from the chapter you expect the least to be asked from.
In 2018, Semiconductor was the chapters from which nearly 15-20 questions came singly.
The best way to prepare is
Slowly and steadily, go through each and every lines of the book.
Thereafter, ask a simple question to each of the statement.
"Why ?"
If you get the answer to the Why in subsequent lines, mark these statements with a highlightner or write them separately ina notebook.
Do the same for each and every subject.
Trust me, it would be a lot of help.

Good Luck !

Dear candidate,

Try to clear your concepts. You can read your text book throughly. If you have any doubt try to clear it.

You can make your important notes which will also help you at the time of revision. Focus on the topics which carries more weightage in the exam.

Here are some of the important tips you can follow:

Chemistry : General Organic Chemistry (EXTREMELY IMPORTANT), Hydrocarbons, Equilibria, Bonding etc. Also, be very thorough with reactions of p-block elements.

Physics : Modern Physics, Waves, Heat and Thermodynamics, Ray Optics etc.

Preparation Tips:

Be thorough with basics in Physics, Chemistry  of your Class 11th and 12th Board.

Practise solving a lot of previous years sample and mock papers of AIIMS to get a fair idea of the test pattern. Try solving mock AIIMS papers within the assigned time to improve speed.

Maintain a study schedule and update it regularly with tasks accomplished and those that are yet to be attempted.

Focus on weaker topics

You can consider below points for PHYSICS:

Start by reading NCERT textbooks. They are a little tough to understand, but are good. You can also use a reference books like dc Pandey. Memorise the formulae properly.

Practice mcqs with a variety of questions. Use a watch to give yourself limited time, to create exam like condition.Attempt all the wrongly answered questions 3-4 times before asking doubts.

CHEMISTRY -

Study pradeep's objective chemistry for Physical chemistry. It is an awesome book for MCQ'S. It has questions sorted out topic wise and difficulty wise of each chapter. For inorganic, read NCERT. Read it throughly, don't leave any point. For organic, read NCERT and solve questions from Pradeep

Most important thing:

Follow previous year papers to understand the level of the questions asked in the exam and give online mock test series for your practice & to assess your preparation.

Join Mock test to analyze your performance.

Hope I answer your question and it's  helpful.

All the best