I'm applying to them as well. For Bancrofts, I'm taking Math and Physics. And for Forest, Math, Chemistry, and Physics. I'm really worried about it. Have you done any prep yet?
I'm not really that nervous about Math and Physics but more so for Chemistry and dead scared about the interview. My interviews are the same week as the exams for the two schools as I'm only in England for a week. I live abroad.
Out of interest, do you know what you're going to wear? Also, what are you taking for your a levels (or planning to take?)
Good Luck. You'll probably ace the test.