Hello hello !!

I am hoping that you are absolutely fine. As per your mentioned query, i would like to know you that th ere are two main levels and one optional level of the courses. So , yes you have an opportunity to learn the subject in detail after your schooling too. Bachelor of arts in hindi is for undergraduate students and Master of Arts in hindi is for postgraduation. Also D octorate/PhD in Hindi is for optional for you.

To know about entrance exams for hindi and to know about the course in detailing you can go through the given link :

https://www.careers360.com/courses/hindi-course

I hope it helps !!