Firstly,basic concepts of all the subjects regarding cmat syllabus should be very strong.secondly, calculation part which is most important should be very fast,as per the time.Once preparation is done start with various mock test ." Practice" is the motto for cracking all the exams .....Anyone can crack any exam ...If they really do the things with focus and sincerity...All we need to do is practice ..Practice and practice...Read as much as you can,update yourself daily,...