Dear aspirant,
You don't need to fear or worry as the age limit for SBI examinations are 21-30 years, therefore actually your age which is 21 is just beginning and you have 9 years to prepare and give examinations every year as examinations are held.
You can start your preparation as soon as possible, meet the eligibility criteria and if you can join a good coaching institute or you can also get books and start self studying.
Hello aspirant,
You can definitely give your 100 percent as it is just starting of your career life
I hope it helps,
Best of luck.
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