Isca study material applicability

ICAI's February 2015 Newsletter says, that the relevant Study Material applicable for May 2015 Examination is, August 2013 Print for ISCA..... But however there is this 2014 Print of Study Material with Recent Amendments. Should I read the amendments in the Latest Print & the rest from Aug 2013 Study Material (or) Trust our Institute &just read my old Aug 2013 version only?