if you understand the purpose of this subject then it's not difficult to learn and write in the exam.
mugging will not help, because if you mug up and you do not understand what is asked in question, then mugging will be of no use.
I will suggest if you have accessibility to Swapnil Patni's class, try that.
if you don't know how/what to do its always better to go to experts and outsource, instead of wasting the time in playing on your own, it cost money only but it can buy you peace.
if you are looking for the career in IT/IS Audit, then it's better to go for in-depth study else prepare to get the exemption by outsourcing and leverage on other subjects.
before joining his class I got 19 and after his ~25 days class, i got 57, I could not cross 60 because of my handwriting.
truly speaking I did not spend much time, only attended his class and read his material 3 times.
here I am not promoting anyone's business, just sharing my experience.