Auditing and ITSM both are theoritical subjects. U need to have a planned study and specific content study and specific approach to answer each and every answer. Common answer in related topics will not fetch you marks in Auditing and ITSM. Ofcourse, You can prepare a common introduction for the topic and can use in all questions related to that topic. but main answer should be specific to the questions. Mere reading is not sufficient for this. U need to go through the Practice Manual of Auditing and ITSM thoroughly. For a topic there can be 2 questions like characteristics and importance of a topic. tough the points may seem similar but not exactly same. Mixing up these points makes you loose marks. So, you need to learn such questions nicely and also understand and learn the points nicely so that you don't mash up the points in examination for Auditing and ITSM. U can refer suggested answers also to know the questions and required answers by the institute, Practice Manual is to be thoroughly prepared and learn the points specific to the questions, don't just read and leave that will lead to mashing up of answers in examination. Specific questions to each question as given in Practice Manual is required to be given to get marks in auditing and ITSM

As per my experience study and revise thoroughly only the study material., practice manual, compilation of past answers is enough and follow the marks distribution pattern as given under study material provided by ICAI is enough to score good marks in the subject.