Dear aspirant!

I hope you are doing great!If you want to be appear for SSC CGL exam.,then it requires graduation and with your graduation you can start your preparation.As your age is 19 ,hope you are doing your graduation as well.Also income tax officer is a high and reputed post ,it requires a lot of hardwork .the right time for your preparation has started.please be consistent and honest towards your studies.No one can stop you to achieve your dreams.

For more information regarding SSC CGL  syllabus or process you can refer the link given below:

https://competition.careers360.com/articles/ssc-cgl-syllabus

I hope it will help you.

Thankyou!