I respectfully beg to differ with your teacher, i hope he is fully acquainted with the requirements of CSS English, if he is just an English teacher and you are counting on him then you better be careful as in this PMS exam many experienced teachers have miserably failed in both Essay and composition paper and they also have M.Phil degree and have been teaching English for half decade, even there are many on this very forum, i won't name them though...the purpose of telling you the whole story is that if you rely on him because he teaches English then this is not a good bet...

we have to hit the bull's eye, you gotta write the expansion in 250-300 words. how can you manage to properly describe the given topic and give different perspectives as well staying within the words limit?