I did my official IOP on pride and prejudice and I got predicted a 7, so I would advise you to know your topic pretty well (this might sound obvious, but surprisingly a lot of people in my class were unprepared and ended up stuttering and stumbling through the whole thing).
If you are confident in presenting, that will definitely help your grade because it shows that 'you know' what you're talking about. If you sound confident, you could be saying bs and it could fool the teacher (to a certain extent of course).
Just structure your points like you would for any other English essay, and you should be fine! Don't waste time on irrelevant facts- try to be concise in your points so that you don't end up rambling on and on about 1 insignificant quote.