06 July 2015
You must must must read Study material. Try to understand the pattern of questions and prepare accordingly. For revision you can refer RTPs and PM. Don't waste time in reading other materials. You may feel Material dry but you have to read.
It is important to use right reference book for the subject from the very beginning. For Information System control and audit paper you may refer the reference book of Dinesh Madan along with ICAI Study Material. Jignesh Cheda or Manish Valecha also preferred by many students. However my personal choice would be Dinesh Madan along with ICAI Study Material.