what are the subjects required for biomedical engineering? Is maths compulsary or both maths and bio are compulsary? and when will be JEE MAIN 2015 rank be declared?

As per your query, let me tell you that Biomedical will require advanced knowledge in all branches of science (physics, chemistry, biology), advanced mathematics (calculus, and differential equations), and you'll also be required to know the basics of engineering including such things as Thermo-dynamics (how heat effects fluids), electrical engineering (circuits), and probably a little bit of economics as well.

All of that will just be your base. On top of all of these, you'll also have quite a lot of course work dealing specifically with the biomedical field. It's about as tough as a major can be. I may suggest the following places to pursue your degree – Lovely Professional Uni, Phagwara,..........DTU, New Delhi,.............Maharishi Markandeshwar Uni, Ambala