Hello Harish !
AIIMS is the most coveted and difficult medical exam of the country because of the stiff competition and the Assertion Reasoning questions.
But, if you prepare well you can get a good score.
Here are a few tips -
1. Prepare a timetable
2. Make a list of all the important formulae
3. Revise the key chapters
4. Practice previous year question papers and sample papers to get an idea about the paper pattern.
All the best !
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