When I can register for CAT exam to take admission in IIM this year.

Candidates should first understand basic concepts, including divisibility rules, prime factorisation, HCF and LCM, and remainders. They should then solve topic-wise practice questions and previous years' CAT questions to improve accuracy and problem-solving speed.

There is no fixed number of questions from the Number System in CAT. The number of questions varies across exam slots and years. Candidates should prepare the topic along with other important areas of Quantitative Aptitude.

Yes, the Number System is an important topic for CAT Quantitative Aptitude. Questions may test concepts such as divisibility, remainders, factors, and properties of integers. Candidates should also practise applying these concepts to different question types.

The CAT Number System covers topics such as divisibility rules, factors and multiples, prime numbers, HCF and LCM, remainders, unit digits, factorials, integers, rational numbers, and properties of numbers.

For CAT Data Interpretation preparation, candidates can refer to Arun Sharma's books for CAT DILR. His books cover this topic comprehensively.