Avijeet, according to the eligibility criteria of CUSAT candidate must have secured minimum 60% aggregate in 1physics , chemistry and mathematics combined in 10+2. Also, the candidate must have minimum 50% in mathematics. And there is no age limit to apply for the exam. For more information , you can go through thr link given below:

https://engineering.careers360.com/articles/cusat-cat-eligibility-criteria

Thank you!