Dear Ankit ,

First of all believe and confident we need to any thing to achieve and your mom said correct .If you are really interested to crack   Bank CET then you can start any of moments and age is not required much more ,might be you will face little bit difficult to catch new things but if you dedicatedly serve to study then you can achieve. First collect some previous 4-5 years questions paper and go through it ,then only you know the idea about which types of questions was a came previously and you go through from starting .

Hope it will helpful and best of luck.

Thanks