i think preparation for iitjee exams cannot be done just by studying on computer.you need to solve problems & examples on paper by urself.this is a good site .u have a large no. of experts answering ur diubts. i am rishabh,2nd year student,mech engg,iit bombay. i belong to a small town. there is no tutor who prepares students for iit. i did not join any coaching classes.i joined rsm from fiitjee.and followed it religiously. my AIR 440 i never referred to any site for study.i used to ask my doubts by writing query-letters to fiitjee.
believe in urself and work harder .concentrate more on books.