My chances of getting an Oxford interviewWatch
You can find over 5 years of past papers if you follow the links on that site.
Your grades are fine, but those alone won't get you a into Oxford. Providing you do well on the HAT you may be invited to interview where they will be looking closely at your interests, reasoning and understanding of various topics. I would say that you may need to broaden your range a little bit more, the Renaissance may be a particular favourite period for you but you will need to show a greater understanding of more than that.
That aside, having genuine interests that don't necessarily fall within the school curriculum and that you have discovered and researched yourself is always going to be advantageous.
Try not to get to worried about it, give it a go and see what happens.