Hello,

Of course, you will write the optional paper of Bengali Literature in bangla lanaguage only, this holds true for even other aspirants going for regional language as per their preference, for example if someone chooses Marathi then he or she needs to write the paper in that language only,

So, to answer your question yes, you can write the general studies paper, essay in English and the optionals paper in bangla if you choose bengali literature, there are two optional papers of 250 marks each, all the languages included in the optional paper are part of eight schedule of the constitution, and apart from this there are also two language papers which are qualifying by nature.