Revalidation of registration query

Hello,

         I need help !!!!!! my registration is expired in january 2014...so kindly tell me what exactly is the procedure to revalidate my registration.. ,secondly once my revalidation is done can i give  may 2014 attempt?? thirdly i have been constantly trying to reach icai kanpur without any success...it would be of great help if u could provide me with any student helpline number of icai...