Born and brought up in the city of Kolkata, I've been surrounded by people who speak Bengali almost all my life. We speak a different language at home and my schooling has been in a different language, again.
I can speak Bengali fluently, and my grammar, when it comes to speaking, is better than even native Bengali speakers, at times.. I don't know how to read and write the language yet but need to learn it for an upcoming exam, where I'd be asked to translate a few things from (printed) Bengali to English.
What's the best way to go about it?