Ответ:
Dear Zoe,
Thank you for your email. I usually do my homework in the evenings after school. Yes, my teachers give us quite a bit of homework, but I think it helps to reinforce what we've learned in class. The most challenging subject for me is definitely mathematics, but I'm working hard to improve. How about you? Do you find any subject particularly difficult?
Looking forward to hearing from you soon.
Best wishes, [Your Name]