Gosh!!! I have seen many Indian Bengalis, wherever they live in India, their parents always ensure that their Children should know Bengali language, Bengali literature, Bengali folk music and folk dance though mutual co-operation.
Don't you have that tradition among Bangladeshi.
Well majority of us do know very good bengali. But some in English medium can't read bengali very well and some of them have a
hard time speaking Bangla. I know how to read & write bangla very well but do lot of spelling mistakes.