IBSAT Preparation

If you are preparing for CAT exam then you don't need to prepare separately for IBSAT exam. The reason behind this is the topics which are asked in CAT exam are the same topics that are asked in IBSAT exam. So, both exams are almost same but the thing differs is difficulty level. CAT is tougher as compared to IBSAT. So, try to prepare for CAT exam because this can help you score good marks in IBSAT.
IBSAT exam includes Reading Comprehension, Verbal Ability (VA), Quantitative Aptitude (QA) and Data Interpretation (DA). Whereas, CAT exam includes Verbal Ability (VA), Reading Comprehension (RC), Data Interpretation (DI), Logical Reasoning (LR) and Quantitative Aptitude (QA).
So, both the exams are having similar content. Preparing for CAT exam can cover the IBSAT exam syllabus too and this can help a candidate in every aspect.

There is nothing like an important topic for the preparation. You have to go with complete preparation for the exam. There are a number of exams conducted in India for the MBA type courses. Exams like CAT, XAT, GMAT, MAT, IBSAT, NMAT, SNAP, etc. have some minor tweaking and variations apart from the main sections. Each of these exams has quantitative aptitude, verbal reasoning, logical reasoning and data interpretation, apart from GK or essay writing section in some of the exams. So, you have to prepare accordingly for these exams either by taking coaching classes or correspondence course or by self-preparation or by following recommended books. After you have prepared for the most difficult level questions, you may try to get some question banks for the specific exam you are targeting either offline mode i.e. books on exams or online mode i.e. free question banks websites or paid question banks for practice.