Hello,

Company Secretary (CS) can be opted after class 12 and also after Graduation.

Duration for the course is-  2.5 years (after graduation), 3.5 years (after Class 12)

Students need to clear 3 levels of examinations along with 16 months of practical training, on completion of which they are enrolled as an Associate member of the Institute and designated as Associate Company Secretary (ACS)

For detailed information about the course, you can refer to the  linkn below-

 https://university.careers360.com/articles/company-secretary-cs

Hope this helps. Good Luck!