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.
Suggestions to handle Information System Control and Audit [ISCA]
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