Dear Pramod, CAT stands for Common Admission Test that tests the Quantitative Ability, Verbal Ability, Reading Comprehension, Data Intrepretation and Logical Reasoning. 20 IIMS and  more than 100 B schools across India participate in CAT. 
This is a 3 hour Online test in which every year almost 2.5 lakh.MBA aspirants participate for admissions. The CAT shortlisted students will be then called in for further rounds like Group Discussion, Written Ability Test and Personal Interview.
As this is a test for admission into MBA, the basic eligibiloty criteria is that you should have completed your Bachelor's degree in any discipline with a minimum aggregate of 50%. It is 45% for Reserved Categories. Those candidates who are in the final year of Graduation also can apply. There is no age limit for applying for CAT.
CAT 2018 was over and you need to wait for CAT 2019.

Hello Pramod Sharma,

CAT is a national level computer based entrance test conducted by Indian Institutes of Management (IIMs). The test scores are accepted by the IIMs and various top B-schools across India. This E-book by Careers360 presents All About CAT, where an aspirant can get details about this national level test. If you are a CAT aspirant, you must read this e-book for eligibility criteria, application procedure, exam pattern and other details about the selection and participating institutes.

For more information download the e-book from the link given below -

https://bschool.careers360.com/download/ebooks/all-about-cat

Thanku.

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