I did it in October and got 29, although I got higher when I practiced, which was a good enough score for Oxford and Durham. I started revising after my year 12 summer exams, for about an hour or so every other day, probs less. I know it’s a test your not meant to revise for and in an ideal world that would be so, but with only two practice tests online it’s very difficult. I bought the UniAdmissions course, which is effectively an online book, but it was very useful. For the essay I gave my history teachers some to read to comment on technique, which is worth doing anyway as it improves your essays in general.