CAT

No, you do not need to apply separately for the IBSAT exam if you have already scored well in the CAT or NMAT exams. As per the latest guidelines of the ICFAI Foundation for Higher Education, which conducts the IBSAT you are eligible for admission into IB colleges with other management test scores apart from the IBSAT. From 2020 onwards, the following exam scores are accepted for admission to the MBA courses:
1. CAT
2. GMAT
3. NMAT
4. XAT
You can take admission to the MBA programme offered by IBS Dehradun and IBS Jaipur with any of the above test scores. In addition, you can take admission in the PGPM, which is offered by IBS Ahmedabad, Gurgaon, Kolkata, Mumbai, and Pune.

It is difficult to prepare for all MBA entrance exams with one book due to different exam patterns. Also, since there are multiple sections in each exam, one book might not be able to cover the complete syllabus of these entrance exams. However, there are certain section-wise books that can be referred to for different MBA exams. These are:
1. Arun Sharma or R. S. Agrawal for quantitative aptitude
2. Nisiht Sinha or Pearson for data interpretation and logical reasoning
3. Arun Sharma or Odisha Publication for Verbal Ability
4. For logical reasoning books by Arun Sharma or Nishit K. Sinha
You can choose any of these books to prepare for the exam according to the syllabus.

The Quantitative Aptitude section is one of the most scoring and tricky sections in the CAT. You can follow the given expert tips to improve your score in this section:
1. Learn to do mental calculations to solve questions with the minimum amount of calculation.
2. Memorize all important tables, square roots, and cube roots to do faster calculations.
3. Create some unconventional methods to arrive at answers in less time. This is possible in the percentage, ratio, and Number System topics.
4. Make a list of recurring question types in the quant section to practice such questions more.
5. To improve your score in the quant section, you must analyze areas in which you are scoring less.
6. You need to focus on the conceptual clarity of such topics where you are not scoring well.
7. You can learn some tips and tricks from YouTube and guides to solve time-consuming types of questions.
8. It would be better if you were able to create your own methods to solve questions and perform well in the exam.
9. Read all questions quickly and begin with the easiest before progressing to the more difficult ones.
10. Fix a time limit for attempting each question and practice as much as you can in the limited time you have.

The Quantitative Aptitude section of the CAT can be very scoring if you have command over the basics and have practiced well. Some of the important expert's tricks used for solving the quant section of the CAT exam are as follows:
1. There are around 22 questions from Algebra Trigonometry measurement, and modern mathematics in this section. With conceptual clarity in mind, you need to practice these sections as much as you can.
2. Learn the skill of solving questions with a minimal level of calculation. It will come with practice but will eventually save precious time.
3. Try to use tricks to solve multiplication and division questions in a short time.
4. Memorize important tables, square roots, and cube roots for faster calculation.
5. Create some unconventional methods to solve ratio and percentage problems in less time.
6. Make your own tricks in this section for better recall in the exam.
7. While solving questions in the CAT paper, start with easy and well-practiced problems.
8. Fix a time limit for every question so that you can focus on solving all questions instead of worrying about one difficult problem.