First, Apologetics Press, offers a monthly children's magazine called "Discovery," focusing on Scripture and science for kids in grades 3 through 6. This eight-page periodical contains lessons from Bible to nature, teaching kids about God's Word. Activities such as word searches and puzzles reinforce the lessons.
A printed monthly subscription to Discovery is available at a reasonable cost; however, a PDF of their magazine is also available for FREE on their website. To see the latest issue, click HERE. You can read the issue online or go to the menu at the top to download a PDF copy of that month's issue.
For high school students, APs banner publication, "Reason and Revelation" covers topics such as God's existence, the inspiration of the Bible, the creation/evolution controversy, the deity of Christ, ethics, the culture war, and more. This periodical is also available in a print subscription or you can download a FREE PDF of the magazine that can be read offline.
Another magazine for high school students is "Acts & Facts," a FREE printed publication available from the Institute of Creation Research and is appropriate for your high school student. This monthly news magazine contains articles and information of current interest dealing with creation, evolution, astronomy and related topics. Current and past issues are available to read online, but to sign up for a free printed subscription, you can go HERE.
Both of these organizations have many other materials and resources. Be sure to peruse through their websites and sign up for email updates to be notified of when new issues of their magazines are online.
For more free science for middle school and high school, check out the FREE Astronomy course here on my blog.