I am helping my first-grader review for his end-of-terms. The teacher said, just let him review. I looked at his texts, and thought, OK, so how do you just look at math and review? I did a search on the web and found a few places to get review material and practice tests, in Chinese, for the public school material taught over the different grades. If you have something else to share, please do. It will help all of us trying to assist our kids with the added struggle of our language incompetence.
Your School's Own Website: Ask your child's hometeacher to show you how to access their class' page on the web. Teachers will post useful links like material to review, or recommended texts, on the web. If it takes too much time to find it yourself, ask them to give you the direct link to the most useful page. Don't be afraid, there is always a parent who will be pushier than you.
Publisher's Materials: Check the back of your child's book for the website of the publisher. I just found out that the publisher of my child's texts has a lot of online materials for students. That includes games and printables.
Independent Materials: I just started looking but I want to publish this post to help others in my position, so please refer back to this page over coming days.
The Math Test Project - This page is the grade one practice sheets. Each number at the top of the page refers to the grade you want to access. Scroll down near the bottom to get sheets that cover the second semester's material. 基礎篇 = basic 實力篇 = a little harder 挑戰篇 = challenging. Choose the level you want. It prints out a PDF very easily, in color. (There are many topics covered, and the topic list is on the left, for example for grade one, 四、時間和日期 = number four, time and date. If you are not sure what they are, either ask your child or just make them do all of them.)