text: for gs-mains study material of which coaching institute will be better? 1.interaction 2.vaji ram 3. rau's or   it depends on the subjects. considering your subjects - chemistry and hindi, i think vaji ram or rau would be better for hindi but i am not sure about chemistry. where do you stay, it is not very difficult to get the info about whose study material would be better in case you get in touch with some of the candidates who are appearing for exams.