Hey sukanya!!

dont bother about sets with difficult questions and sets with easy questions.

even though if one gets difficult questions and others get easy set, IIT JEE would make sure that the difficult set students arent at a disadvantage with the easy set ones and they normalise the scores based on the marks scored by each and every student in the respective difficult and easy set ones.

do not worry about getting difficult and easy set pnes.

stick to your basics and study well.concentrate on previous years questions and train yourself to give your best in any situation.

for more details regarding the normalisation process please go through the following link :

https://engineering.careers360.com/articles/jee-main-normalisation-process-how-scores-are-calculated

thank you and alll the very best sukanya!!