Sir in cat exam there will be negative marks right if we answer wrong then only one mark will be deducted or 4 marks including 3 marks??

Yes there will be negative marking. Your one mark will be deducted for every wrong answer. However there are certain questions in every section which do not have negative marking, these are the non MCQ types questions.

For a correct answer you will get +3 marks, for an unattemped question you will get zero marks and for a wrong answer you will get -1 marks. There won't be any -4 marks for any wrong answer.

But logically you will be losing 4 marks for an incorrect question. Assume you had a score of 50 marks and now if you get a correct answer your total marks will be 53 but if you do the same question incorrect then your marks will be 49. So logically because of that question you lost 4 numbers but in real only 1 marks are deducted from your total.

All the best for your other exams and CAT result. Don't forget to apply for other private colleges in which you are interested and think has a possibility of getting admission after your performance in exam.