It is an extremely prestigious national level exam. It is conducted by IISC one of the most prestigious science colleges in the entire WORLD.
You can give it in both class 11th and 12th. In 11th class you will have to attempt PCB and MATHS too!!!. But in 12th you just have to attempt PCB. I failed miserably in class 11th (cutoff was 55 something and i barely managed to cross 40); But in 12th I got a rank of 38.
It consists of 2 parts Theory and Interview. I scored 84.5/100 in theory and 56/100 in interview ( of course in class 12th)
To prepare for the theory part you will first need to assess the difficulty level of the exam. This you can do by looking at the PREVIOUS YEARS PAPERS . Click here for the papers.
After solving the papers you must check the solutions to the questions in which you got stuck because although the question might not get repeated but the concept might. You could check the solution from any famous coaching answer key. (I am not associated with any coaching but i just want you to make full use of the resources available to you). Click here for resonance kvpy 2015 answer key and solutions.
To know more about preparation for the intervew. Click here.