I studied A Passage To India last year. I didn't do it in the exam, but perhaps i could give you a few ideas.
You could talk about Mrs Moore, a woman who throughout the novel gradually becomes a symbol of freedom and justice to the Indians. There is Adela, who conforms to the pressures of the British in India and their determination to segregate themselves from the natives. There is also the British woman in general, who are always seeking to discriminate the Indians and mock their way of life.
Basically you can contrast the different attitudes of woman in the novel and how they are portrayed by Forster. Some critics say that Forster imparted some of his personality and ideologies into the character of Mrs. Moore, who is portrayed as the "ideal" British woman. Forster wrote the novel from a different perspective to most literature at the time, which tended to write from a British supremacy viewpoint, and for Forster to not only write from a perspective focused mostly on the Indian injustice, but to portray a woman (Mrs. Moore) as the hero of the story was very different.
Not sure about how much of what i said is to do with the feminist viewpoint but hopefully this gives you a few things to think about.