Dear Friend,
see this what i am giving in bold letter is issued by ICAI
Students, who have registered for the course on or before 31st December, 2009 and completing 4 years validity period till 31st December, 2013 are advised to apply for revalidation before 31st December, 2013 without paying revalidation fee. In case any student fails to apply for revalidation by 31st December, 2013 he/she then shall have to pay the prescribed revalidation fee, as stated above, on or after 1st January, 2014 for revalidating the registration.