In Quant or DI questions do not waste time in finding the values of the variables as it may not be necessary. Sometimes we just need the ratio(s) and not the actual values.
In an RC passage, making a 5 – 10 word summary of each paragraph, and writing it beside the paragraph increases retention and understanding of the passage.
The greatest number that will divide a, b and c leaving remainders x, y and z respectively, is the HCF of (a- x), (b - y) and (c - z).
While reading the passage, develop a habit of mentally summarizing each paragraph and keep linking them throughout the passage. This helps in understanding the overall idea of the passage and makes inferential questions seem a lot easier.
Don’t judge a book by its cover and a question by how it appears at first glance. In every successive CAT, there have been easy questions camouflaged as difficult ones. Though it makes good sense to attempt the easy questions before the difficult ones as they carry the same marks, it always pays to have a closer look at the ones that seem difficult. Cracking or leaving them could make the difference between getting an IIM call or missing it.
If (x + 4y) is divisible by 13 where y is the units place digit and x is the number obtained by removing the last digit, then the number is divisible by 13.
In Paragraph Completion questions, eliminate options that appear to complete the paragraph but also add new data which require elaboration.
Habits maketh a man (and woman). This applies to your CAT preparation as well. Rather than slogging it out on a few days when you are in high spirits, and taking some days off when don’t feel upto the mark, make it a habit to study for a few hours everyday, no matter what. Your study regimen will help you perform on the day of CAT too - not because you feel good, but inspite of feeling pressured.
If the difference in the sum of all the odd-numbered and even-numbered digits is a multiple of 11 (including 0), the original number is divisible by 11. For example, consider the number 102190. The sum of the odd-numbered digits is 12 and the sum of even numbered digits is 1. Since the difference (11) is a multiple of 11, the given number is divisible by 11.
In Paragraph Summary and Paragraph Completion questions, first ascertain clearly the gist or the central idea of the paragraph. This will help eliminate options that do not resonate with the central theme.
Before any of the actual exams, it helps taking some time off every day and rejuvenate the mind. For about an hour everyday, do what you really enjoy. This will help you relax and improve your concentration in the mocks and the actual test.
If the number obtained by subtracting twice the last digit from the number left after removing the last digit, is divisible by 7, then the original number is divisible by 7. For example, consider the number 161. The number left after removing the last digit is 16. If we subtract twice the last digit i.e. 2 from this we get 14. Since 14 is divisible by 7, we can say that 161 is divisible by 7.
In Fact, Inference, Judgement questions, it helps to take the elimination route rather than the selection route. Identify a statement which is definitely a Fact, an Inference or a Judgement, and eliminate options that do not qualify it accordingly. This will help you move closer to the right option.
Natural numbers ending in 0, 1, 5 and 6 have unit's digit cyclicity of 1. Numbers ending in 2, 3, 7 and 8 have a cyclicity of 4 and numbers ending in 4 have a cyclicity of 2. In generel, after every four consecutive powers of any natural number, the digit in the unit's place repeats itself.
Look out for a subtle change in meaning in each answer option in Paragraph Summary questions. The degree and tone of the option should resonate with the given paragraph.
If two numbers a and b, leave a remainder of ra and rb respectively, when divided by a number x, then the remainder when their product ab is divided by x is the same as the remainder when rarb is divided by x.
While attempting Critical Reasoning questions such as strengthen / weaken the argument, assumption / conclusion of the paragraph etc. read the question stem first, even before reading the given paragraph. This helps in zeroing down on one core idea without getting boggled by a lot of data given in the paragraph.
To see whether a number is prime or not one needs to check whether it is divisible by the prime numbers 2, 3, 5, 7 up to the prime number less than or equal to the square root of the number itself. For example, to check whether 997 is a prime number one needs to check its divisibility with the prime numbers 2, 3, 5, 7 .... to 31.
Make sure you read all the answer options before you decide the correct one. While there are some answers that jump at you, a more careful reading may shows minor flaws or you may realise that some other option is a better answer.
Make it a habit to attempt mock-cat's in a single sitting. This will help to improve your concentration levels, and prepare you for the actual CAT paper.