Dear Lihua,
It's nice to hearing from you. I quite understand what you mentioned in the letter.People always say,'Faliure teachers success.'I have some recommendations for you to consider: first, my useful experience of math studying is to do lots of exercises. Once you find any problems you always do them wrong, you need to conquer this type of questions at once.The other suggestion of English studying is to read as much as you can. You may choose the articles in the newspaper or even the articles in the textbook, and then recite some good phrases and paragraphs. I hope it could help you with your math or English studying.
Best wishes to you and your family! I'm looking forward to hearing from you soon.
Sincerely,
Liujun