Hi Pawan,
which school would you like to attend? I'd recommend you to ask the school about their requirements.
For continuing school to achieve the Fachabitur (access to a university of applied sciences/polytechnics) or the Abitur (access to university) B1 should be sufficient, for example: https://***.fosbos-wuerzburg.de/preparatory-course-for-the-integration-of-refugees-and-migrants/
For university studies, you can find the language level requirements here: https://***.mygermanuniversity.***/articles/language-requirements-german
Here you can also find more information about the different certificate types:
https://***.gls-german-courses.de/2008.html
https://***.goethe.de/en/spr/kup/prf/prf/gb1.html
https://***.gls-german-courses.de/2008.html
if you have any further questions don't hesitate to ask :)
Best wishes,
Anita