Hello,

To be eligible for CAT Candidates must have scored 50 Percent in graduation. Final year students are also eligible to apply. Now coming to your question, if you have passed your 12th then only you can get Admission into Graduation. And only after the completion of Graduation you can appear for CAT or must have reached in the final year of graduation.

Now, if you have failed class 11th, don't worry, you will get easily promoted in 12th. Even if you repeat class 11 and pass class 12th after one year then also it's not a problem at all. Pass your 12th to get admission into Graduation and reach atleast in the final year of graduation to be eligible for CAT. I hope you have understood.

To know more about CAT, Syllabus, eligibility criteria, please go through this link

https://www.google.com/amp/s/bschool.careers360.com/articles/cat-eligibility-criteria/amp

Good Luck.