I am from Hyderabad,india i was best student in the class in 6th standard after couple of years i found my self in difficult place later on i did not clear my 10th exams too.
Then Robert our maths teacher has noticed my raw talent and he said you are having amazing talent in maths so he said you need to concentrate in other subjects
Funny is that i failed in my mother langvage in 10th later on i realized its nothing the passion towards maths had made to pass in 10th second time.
Later on i never looked back as i completed my b.tech and m.tech from IIT Bombay.one thing i need to share with you.you need not be best in all subjects its enough if you are a master in one subject.