hello student,

sorry to say you but you have not mention about which school or college or which medium you are talking about.that's why it is quite difficult to tell about that thing.however basically if any course or if any school's medium is going to change into Bengali medium from any other medium then there is a a cap and use processing time between two mediums.also some schools offers current student of current medium to stay in that medium only and from the next educational year they provide admission in the English medium students.once you are in any other medium and want to get into English medium you can directly do this by writing an application to the school authority itself.hope this will help you.