which book to refer?

ALL ICSI Material but for tax follow  V. K. Singhniya 

Dear Manmohan, Singhanis is not for CS Executive, ,T. Manoharan is good. ald as u siad ICSI study modules

here are the suggested readings as suggested by one of most active , sincere and active member "Ankur Garg"

1) General and commercial law==Study Material + Scanner problems with ICSI Guidelines solutions of previous exam especially for practical problems and their presentation.

2) Company Accounts == Shukla & Grawal + Question given in Study Material
 
3) Cost and Mgt. Accounts == S.N. Maheshwari + Question given in Study Material

4) Tax Laws--Girish Ahuja (for theory) & V.K. Singhania for practical problems

5)Company law== Munish Bhandari + Study Material + Scanner

6)Security law and compliances--Study Material + ICSI Guidelines + Study Material

7)Economic and Labour laws.— Study Material + Scanner  with ICSI Guidelines of previous exam

Hope it will help.....and I am also preparing for december 2011 executive exams as per these suggested readings.......