Well you can not use the physical calculators for the CAT exam .

There may be on screen calculator provided for calculation in all sections in CAT

The level of questions is not set hard from calculation point of view.

If you know the strategy to solve the question, you will be able to solve without using the calculator faster rather than using the calculator

CAT Exam Pattern

Sections 3 –

Quantitative Ability

Data Interpretation & Logical Reasoning

Verbal and Reading Comprehension

Number of Questions
100

Quantitative Ability –
34

Data Interpretation & Logical Reasoning –
32

Verbal and Reading Comprehension –
34

Duration
180 minutes

Sectional Duration
1 hour for each section

Question Types
Multiple Choice Questions (MCQs), Non-MCQs

Calculator Usage
On Screen basic calculator will be provided

Marking Scheme for Non-MCQs,

+3 marks for ‘correct answer’

No marks(or negative marks) for ‘wrong or no attempt’.

The scoring scheme for multiple-choice questions (MCQ's) is:

+3 for correct answer

-1 for incorrect answer

No marks are given or deducted for un-attempted questions