how can i prepare for Aiee & IItjee without coaching

I can tell you the way I did. I used ML Khanna for maths along with RD SHarma(11th and 12th ones), HC Verma and SL Gupta for Physics and OP agarwal for chemistry. do these books thouroiughly and you will be able to crack atleast AIEEE. I started using these books from the beginning of 11th standard

really , there seems to be very few students who are willing to preapre themselves, Even I want assure you that it is quite possible to preapare for iit jee and for aieee without help of coaching institutes. IF one can avoid negative marking than with the same stuff one can get through IIT JEE also.

Well, frankly speaking, go for self preparing only if you have enough patience and discipline to sit on your own to study regularly throughout the year... By this means, you would have to refer a lot of books and if you have your willpower with you, trust me, IT IS BETTER THAN GOING FOR SOME COACHIN