sir i am now in i i i t(indian institute of information technology) persuing btech in it 1st year and i am a fresher so whether i should do the preparation for iit or aieee or not?

 In my humble openion concentrate on present studies, you are persuing a good course, it is better to continue. If you are sure without affecting your present studies you can appear for JEE then go ahead but not at the cost of present career.