Presently doing 'A' Level at Calcutta International School, Kolkata. How will I to get admitted at IEM, Kolkata as a Foreign National ?

I am a British National and PIO card holder. Presently I am studying at ‘Calcutta International School’ and doing ‘A’ level in Physics, Chemistry, Mathematics and English under Edexcel board, U.K. I want to join the B.Tech in engineering at IEM (Institute of Engineering and Management), Kolkata.